Social Interaction - Friends
Add Friend: Open Friend window. Click on "+ Friends", and then on the character you want to make friend. After they do the same to you, you two will be friends and you can find his name in your friend list.
Friend List: If your friends are online, their names are white and red when they are offline.
Click on your friend's name, you will find "Check" and "Delete".
Check: To view your friend's status.
Delete: Remove him/her from your friend list.