1) To add friends, tap on Social in the top right of the Main Menu.
2) In the Social section, tap on the “Add Friend” button on the sidebar. 
3) Type the player name you want to add as a friend and tap on the Search icon.
4) When the player appears on the screen, tap on the “Add Friend” button to send a friend request.
To see the friend requests sent to you, tap on the “Requests” button at the bottom of the sidebar. You can also accept all waiting friendship requests by tapping the "Accept All Requests" button.