This is probably fairly obvious to someone, but I can't seem to change it. I have a gmail and Facebook account, and when I type a message, my name shows up not as my nickname as set in "Identity," but the whole email and, even worse, the whole thing from Facebook (yourname@chat.facebook.com). It just irks me how long it gets... does anyone know how to change this?

Which version of KDE are you using? Did you see this behaviour in a previous version of Kopete, or has it changed with a recent upgrade?