are you referring to Buddies?  they are part of the private messaging plugin… you can have buddies and adversaries…

or are you referring to something else? if so, what would the functionality be?

Yes, Buddies. But I do not understand how to use it? How can I add someone as a friend?

In your profile, under the buddies tab, you can add or remove buddies… same for adversaries on the adversaries tab…

also, when sending a PM to a user, you can click on the buddy button next to the recipient list and add him to your buddies list..

thanks

np. glad to help.