Two SNs on at the same time

I've been away from Aim for a long time, so excuse me if this is a simple question, but I have another screen name sign on when I sign on Mjordan2nd. I remember setting this up a LONG time ago, but I've forgotten how to disable it. Anyone got any suggestions?

Open up aim. Go to MY AIM > go on down to Managed Linked Screenames > ...that's it. It connects, then you just link it.