changing display name in adium

Can anyone tell me how to change my display name for msn with Adium? I know how to do it normally but for some reason, everytime i do it, it changes back to my first name after i log out and in. I changed it just by double clicking it and changing it on the contact list, I changed it through accounts (edit, display name) i changed it through personal (my name)but nothing works and it keeps changing back to my first name. Can someone help me please?