Urbane Apartments's dashboard

I have a Four Square account, and so does my boss. We're registered under two different emails. Why does it keep pulling my facebook information onto my boss's account. SCARY! I set the accounts up on two different computers, but I have logged onto my own foursquare from the work computer--which is where I just set up his account. How can I get foursquare to forget my info and learn his? Doesn't seem to be a place to enter in a new facebook account.