Change AIM in Profiles to Xfire

[Marsares]

I'm building a forum for an online-gaming clan (www.ewsclan.com) and rather than using AIM, MSN or any other online chat program we use a for online-gaming specialised program called Xfire. As such, I would like to change AIM into Xfire, so that people can add their Xfire log-on to their profile. Where do I need to be looking for this in order to change this? Any help would be greatly appreciated.