You can add friends by:
1. Sending or accepting friend requests while matching (Tap on the icon located at the upper right corner of the screen)
2. Checking your history and send a message to the person you want to be friend with
3. Allowing the auto-add of all your Facebook friends
4. Adding friends by their Azar ID:
Go to the 'Message' tab > Tap on the 'Friends' icon > Tap the '+' icon at the upper right hand corner of the screen > Select 'Add friends by Azar ID'
5. Adding friends from a Lounge tab by selecting a "+" button of user profile
Please note that you cannot add friends using their user code.