Friend/Ignore
Right-click player, Friend/Ignore
Friend: If you define a player as a friend you will be alerted by a sound signal when this player enters the playing room. You can also sort the list according to the social status and get all your friends to the top.
Ignore: This will make it impossible for the player to challenge you or address you in the chat window. Use this for hostile visitors.
You can change the Friend/Ignore list by clicking Edit friend list in the Edit menu. You can sort the player according to their social standing by clicking Social at the top of the list.
See also Find friends on the map ...