Private Mode lets you control who can add you on Bump.
When Private Mode is turned on, only people in your contacts can add you. This means strangers or people you don't know won't be able to send you a friend request.
How to enable Private Mode
Go to your profile.
Tap on Friending Settings.
Turn on Private Mode.
You can turn Private Mode off at any time from the same settings screen if you want to be discoverable again.