Friend requests on Chess.com
You can send a friend request by clicking on a member's username wherever you see it, such as in your game archive, live chess chat, or by searching for their name on the Members page. Then, click the 'Add Friend' icon (silhouette with a plus sign) to send your request.
You can also send an invite from the member's profile by clicking 'Add Friend' from their header. The member you sent the friend request to has three options once they see the request: Accept, Decline, or Ignore.
There is a limit of 10 pending friend requests at a time. If you've sent out many invites that haven't been accepted, you won't be able to send more friend requests until you cancel some of them.
Mobile
Adding friends from a game you’ve played
Android
Open an ongoing or completed game, tap the member’s avatar, and select 'Add Friend.'
iOS
Tap the member’s avatar, select 'Profile,' and then tap 'Add Friend.'
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Adding friends you haven’t played with
If you haven’t played with them before but know their username or email, you can add them through your friend list:
Tap the Friends icon in the top-right corner of the home screen.
Type your friend’s username into the search bar.
Tap 'Add' on iOS or the '+' sign on Android next to their name to send a friend request. Your friend will need to approve it before you’re connected.
Check out this article to learn how to unfriend a member: How do I remove a friend?