You can rescind your invitation at any time if you change your mind, either before or after it’s been accepted.
1. If your friend hasn’t accepted your invitation yet, go into the “pending” section of your friend list, and tap on the x next to the name of the person you’d like to remove.
2. If your friend is already in your friend list, go into the “accepted” section of your friend list, and:
For Android users, tap on the 3 vertical dots in the top right corner of your screen, and select “remove friend”.
For iOS users, tap the “edit” button in the top right hand corner of your screen. Then tap the red symbol next to the name of the person you’d like to remove from your list, and confirm that you want to remove them.
In both cases, you will not be able to view your friend’s step completion, and they will no longer be able to view yours, unless you invite them again and they accept your invitation again.