What happens when I tap the Friends button?

You can find the Friends button when you tap the "More" button in the top-left corner of the main menu.

This feature allows you to gift and receive Credits for free once a day through friends added in-game or friends that you have invited to the game.

There are two tabs here. These are Friends, and Rewards.

The Friends tab will show you the full list of friends that you currently have in-game. On the left, you can see that you can have up to 10 Game Friends, which are players that you have added in-game. If you tap the ADD FRIENDS button on the right, you will see a list of in-game players. Tapping the INVITE button will send them a friend request that they can accept under the relevant section in the top-left corner of this screen.

The Rewards tab will show you a list of your current friends that you can accept and/or send gifts to. You can do this individually on the left side of the screen, or tap the ACCEPT & SEND ALL button in the bottom-right to quickly do this.