If you meet someone in the app that you want to become friends with, tap on their icon and then go to their profile. There’ll be an option to send them a friend request at the top of their profile screen.
If someone sends you a request, you can manage them by going to your profile and tapping on “Friends”. There you can choose to accept or reject their request.
You can also tap on “Find Friends” in the same place and invite your friends to join you on Quidd or search existing Quidd users to go to someone’s profile and send them a request.