Hi Brandon;
You'll have to ask people to add you to their list so you can add them to yours. Not everyone will say yes... often people just keep a very short list of friends, or only clanmembers, etc.
Also, people are not allowed to post their xfire names on the forums, so be careful please not to post yours or ask others to post theirs.
BFM_Wic
(Well said MiG, who posted while I was typing, lol!)