If you want to have the tracker in two different phone/app or share it with a friend:
Your app:
1. Open your device in the app
2. Press the "users" symbol in the top right corner of the screen
3. Press the plus (+) sign in the top right corner
4. Press "Generate QR" in the popup
5. Hold the QR code ready for your friend
Friend's app:
1. Press the plus (+) sign in the top right corner of the main screen
2. Press "Add QR code from a friend"
3. Scan the QR code in the other app
You have now shared the Tracker. Both apps can at all times remove the other user from the tracker by pressing the user in the list of users, just press "remove user".
Have fun!