You can send friend requests to anyone by tapping ‘Add friend’ in their player profile. Once they accept, you can see them in the ‘Social’ tab. You have now become Clash Friends!
You can have a maximum of 100 Clash Friends.
In addition to this, the ‘Social’ tab can show all of your friends from the following services:
Supercell ID
Game Center
You can have a maximum of 300 Supercell ID friends.
It’s worth noting that any pending friend requests are counted towards the maximum of 100 in-game friends. If you have 100 Clash Friends or pending requests, you will be unable to receive more friend requests.
You can easily remove friends depending on how you added them:
In-game Friends:
Tap your XP bar
Select the Social tab
Select the Clash Friend
Tap ‘Remove Friend’
Supercell ID Friends:
Go to your in-game Settings
Open your Supercell ID profile
Select the friend you want to remove
Tap the ‘Friend’ icon beside their name
Select ‘Yes’ to unfriend
Game Center Friends:
Go to your device settings
Select Game Center
Tap your profile
Select 'Friends' to open your Friends list
Choose the friend you want to remove
Tap the icon in the top right of your screen
Select 'Remove Friend'