Making a piano photo the primary photo for that piano is easy!
FROM THE WEB APP
This setting can only be changed by logging into the Mobile App at this time.
FROM THE MOBILE APP
Step 1: Tap on a piano you want to edit.
Step 2: Tap on 'Photo Gallery'
Step 3: Tap on the photo you want to edit (or tap 'Add' to add a new photo.
Step 4: Tap 'Primary' to make this photo the primary photo.
Step 5: Done.