Question: how to change the background of your bitmoji?
Answer: Tap the Profile icon at the top to go to your Profile screen ↖️
Tap 'Bitmoji'
Tap 'Edit My Bitmoji' to edit its appearance, 'Change My Outfit' to get new threads, or 'Change My Bitmoji Selfie' to update the way your Bitmoji looks on the Friends screen!