diff --git a/Frontend/app/build.gradle b/Frontend/app/build.gradle
index 3188c4e16ef65dfabfe6809d4da9f9dae6f4a5e4..dfc3163a8f1604f47e9e0c3f0360da3636845792 100644
--- a/Frontend/app/build.gradle
+++ b/Frontend/app/build.gradle
@@ -33,6 +33,7 @@ dependencies {
     annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
     implementation 'com.android.volley:volley:1.1.1'
     implementation 'de.hdodenhof:circleimageview:3.1.0'
+    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation "androidx.recyclerview:recyclerview:1.1.0"
     implementation "androidx.recyclerview:recyclerview-selection:1.1.0-rc01"
diff --git a/Frontend/app/src/main/AndroidManifest.xml b/Frontend/app/src/main/AndroidManifest.xml
index 3e6b8225c653e8e0b1fd9c644a0a683ad06633a0..5459420952ffa8011692c20b804452f17898001f 100644
--- a/Frontend/app/src/main/AndroidManifest.xml
+++ b/Frontend/app/src/main/AndroidManifest.xml
@@ -12,14 +12,17 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".Single_Trip"
+        <activity android:name=".New_Transaction_Screen"></activity>
+        <activity
+            android:name=".Single_Trip"
             android:configChanges="orientation"
             android:screenOrientation="portrait"
-            tools:ignore="LockedOrientationActivity"/>
-        <activity android:name=".Trip_Overview_Screen"
+            tools:ignore="LockedOrientationActivity" />
+        <activity
+            android:name=".Trip_Overview_Screen"
             android:configChanges="orientation"
             android:screenOrientation="portrait"
-            tools:ignore="LockedOrientationActivity"/>
+            tools:ignore="LockedOrientationActivity" />
         <activity
             android:name=".New_PW_Screen"
             android:configChanges="orientation"
diff --git a/Frontend/app/src/main/java/com/example/mobileapp/MemberFragment.java b/Frontend/app/src/main/java/com/example/mobileapp/MemberFragment.java
index cbfb3624bbd659dc2b00174de63a3e3549071b99..2021c221d3c466cbeb44c63b755ae054d11e5af1 100644
--- a/Frontend/app/src/main/java/com/example/mobileapp/MemberFragment.java
+++ b/Frontend/app/src/main/java/com/example/mobileapp/MemberFragment.java
@@ -14,6 +14,8 @@ import android.view.ViewGroup;
 import android.widget.Button;
 
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.google.android.material.textfield.TextInputEditText;
+import com.google.android.material.textfield.TextInputLayout;
 
 import java.util.ArrayList;
 
@@ -48,6 +50,13 @@ public class MemberFragment extends Fragment {
         recyclerView.setAdapter(adapter);
         recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
 
+        rootView.findViewById(R.id.add_member).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                addUserButton();
+            }
+        });
+
         rootView.findViewById(R.id.leave_trip).setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -58,6 +67,32 @@ public class MemberFragment extends Fragment {
         return rootView;
     }
 
+    public void addUserButton () {
+        MaterialAlertDialogBuilder addUser = new MaterialAlertDialogBuilder(getActivity());
+        final TextInputLayout addUserLayout = new TextInputLayout(getActivity());
+        final TextInputEditText addUserText = new TextInputEditText(getActivity());
+
+        addUser.setTitle("Add user to trip");
+        addUser.setMessage("Type in the E-Mail of the user you want to add.");
+        addUserText.setHint("E-Mail");
+        addUserLayout.addView(addUserText);
+        addUserLayout.setStartIconDrawable(R.drawable.person_icon);
+        addUser.setView(addUserLayout);
+        addUser.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                return;
+            }
+        });
+        addUser.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                return;
+            }
+        });
+        addUser.show();
+    }
+
     public void leaveTripButton() {
         MaterialAlertDialogBuilder leaveTrip = new MaterialAlertDialogBuilder(getActivity());
         leaveTrip.setTitle("Leave Trip");
@@ -72,7 +107,6 @@ public class MemberFragment extends Fragment {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 //Delete User from Group, so he cant see it anymore
-                //startActivity(new Intent(getActivity(), Trip_Overview_Screen.class));
                 getActivity().finish();
             }
         });
diff --git a/Frontend/app/src/main/java/com/example/mobileapp/New_Transaction_Screen.java b/Frontend/app/src/main/java/com/example/mobileapp/New_Transaction_Screen.java
new file mode 100644
index 0000000000000000000000000000000000000000..a2f601f049ca8bea7e98b560a5286d08a97da6f1
--- /dev/null
+++ b/Frontend/app/src/main/java/com/example/mobileapp/New_Transaction_Screen.java
@@ -0,0 +1,14 @@
+package com.example.mobileapp;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+
+public class New_Transaction_Screen extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.new_transaction_screen);
+    }
+}
diff --git a/Frontend/app/src/main/java/com/example/mobileapp/Recycler_View_Adapter_User.java b/Frontend/app/src/main/java/com/example/mobileapp/Recycler_View_Adapter_User.java
index 4840f453325009f5f8b3ffa206a9fea8eea609e0..8432c8319577baebb282b19b9f88e392795395fd 100644
--- a/Frontend/app/src/main/java/com/example/mobileapp/Recycler_View_Adapter_User.java
+++ b/Frontend/app/src/main/java/com/example/mobileapp/Recycler_View_Adapter_User.java
@@ -7,6 +7,7 @@ import android.graphics.drawable.Drawable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.EditText;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
@@ -16,6 +17,8 @@ import androidx.recyclerview.widget.RecyclerView;
 import com.bumptech.glide.Glide;
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.google.android.material.dialog.MaterialDialogs;
+import com.google.android.material.textfield.TextInputEditText;
+import com.google.android.material.textfield.TextInputLayout;
 
 import java.util.ArrayList;
 import de.hdodenhof.circleimageview.CircleImageView;
@@ -57,74 +60,86 @@ public class Recycler_View_Adapter_User extends RecyclerView.Adapter<Recycler_Vi
             holder.userAdmin.setImageResource(R.drawable.no_admin_crown);
         }
 
-
+        //Remove User
         holder.userName.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                MaterialAlertDialogBuilder deleteUser = new MaterialAlertDialogBuilder(mContext.getActivity());
-                deleteUser.setTitle("Remove User");
-                deleteUser.setMessage("Are you sure you want to remove " + mUserNames.get(position) + " from this trip? Only an admin can add him back to this trip");
-                deleteUser.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        mContext.getActivity().finish();
-                    }
-                });
-                deleteUser.setNegativeButton("Decline", new DialogInterface.OnClickListener() {
-                    @Override
-                    public void onClick(DialogInterface dialog, int which) {
-                        return;
-                    }
-                });
-                deleteUser.show();
+                removeUser(position);
             }
         });
 
-
         //Set Admin
         holder.userAdmin.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                setAdmin(position);
+            }
+        });
+    }
+
+
+
+
+
+    public void setAdmin (int position) {
+
+        MaterialAlertDialogBuilder confirmAdmin = new MaterialAlertDialogBuilder(mContext.getActivity());
+        confirmAdmin.setTitle("Admin rights");
 
-                MaterialAlertDialogBuilder confirmAdmin = new MaterialAlertDialogBuilder(mContext.getActivity());
-                confirmAdmin.setTitle("Admin rights");
-                if (!mUserAdmin.get(position)) {
-                    confirmAdmin.setIcon(R.drawable.no_admin_crown);
-                    confirmAdmin.setMessage("Do you want to give " + mUserNames.get(position) + " Admin rights?");
-                    confirmAdmin.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            mUserAdmin.set(position, true);
-                            Recycler_View_Adapter_User.this.notifyItemChanged(position);
-                        }
-                    });
-                    confirmAdmin.setNegativeButton("Decline", new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            return;
-                        }
-                    });
-                } else {
-                    confirmAdmin.setIcon(R.drawable.admin_crown);
-                    //Check ob er nicht der letzte Admin ist, wenn ja ist keine Admin entnahme möglich
-                    confirmAdmin.setMessage("Do you want to remove your own Admin rights?");
-                    confirmAdmin.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            mUserAdmin.set(position, false);
-                            Recycler_View_Adapter_User.this.notifyItemChanged(position);
-                        }
-                    });
-                    confirmAdmin.setNegativeButton("Decline", new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            return;
-                        }
-                    });
+        if (!mUserAdmin.get(position)) {
+            confirmAdmin.setIcon(R.drawable.no_admin_crown);
+            confirmAdmin.setMessage("Do you want to give " + mUserNames.get(position) + " Admin rights?");
+            confirmAdmin.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialog, int which) {
+                    mUserAdmin.set(position, true);
+                    Recycler_View_Adapter_User.this.notifyItemChanged(position);
                 }
-                confirmAdmin.show();
+            });
+            confirmAdmin.setNegativeButton("Decline", new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialog, int which) {
+                    return;
+                }
+            });
+        } else {
+            confirmAdmin.setIcon(R.drawable.admin_crown);
+            //Check ob er nicht der letzte Admin ist, wenn ja ist keine Admin entnahme möglich
+            confirmAdmin.setMessage("Do you want to remove your own Admin rights?");
+            confirmAdmin.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialog, int which) {
+                    mUserAdmin.set(position, false);
+                    Recycler_View_Adapter_User.this.notifyItemChanged(position);
+                }
+            });
+            confirmAdmin.setNegativeButton("Decline", new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialog, int which) {
+                    return;
+                }
+            });
+        }
+        confirmAdmin.show();
+    }
+
+    public void removeUser (int position) {
+        MaterialAlertDialogBuilder deleteUser = new MaterialAlertDialogBuilder(mContext.getActivity());
+        deleteUser.setTitle("Remove User");
+        deleteUser.setMessage("Are you sure you want to remove " + mUserNames.get(position) + " from this trip? Only an admin can add him back to this trip");
+        deleteUser.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                mContext.getActivity().finish();
+            }
+        });
+        deleteUser.setNegativeButton("Decline", new DialogInterface.OnClickListener() {
+            @Override
+            public void onClick(DialogInterface dialog, int which) {
+                return;
             }
         });
+        deleteUser.show();
     }
 
     @Override
diff --git a/Frontend/app/src/main/res/layout/new_transaction_screen.xml b/Frontend/app/src/main/res/layout/new_transaction_screen.xml
new file mode 100644
index 0000000000000000000000000000000000000000..9dfe5d4455d017f35508ae6a7c30ad3cf20957a0
--- /dev/null
+++ b/Frontend/app/src/main/res/layout/new_transaction_screen.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#141412"
+    tools:context=".New_Transaction_Screen">
+
+
+    <ImageView
+        android:layout_width="40dp"
+        android:layout_height="40dp"
+        android:layout_marginLeft="40dp"
+        android:layout_marginTop="40dp"
+
+        android:src="@drawable/back_button"
+        android:clickable="true"/>
+
+</LinearLayout>
\ No newline at end of file