QUOTE(RomanBellic @ Nov 23 2008, 12:20 PM) [snapback]1472449[/snapback]
you open up the request in your inbox and there should be 3 buttons to press yes,no and block i think? press yes (obviously lol) or you can scroll down to the bottom of your friends list and find the request and press triangle and scroll down to "reply to add friend request" and press yes.
and if you mean in-game invitations.
just open up your phone and go to multiplayer and look for friends invites (and if you have one the person who invited you there name should be there).
Thanks but I got it and forgot to post back here