Help? How the hell do you log out of here

I was wondering how the hell you sign off your username on this page. Bro bro uses this page as well, and I can never sign out under his name and log in under mine. This is really pissing me off, the only was I can do it us clear my cookies, history in my browser. Shuoldn't there be a "log off" button somewhere in here?????? :banghead:

on the main page that lists all the different car company's, scroll down.

bottom right should say "log out ____"