Where is the logout button?

Well, I just created an account in order to test the service. But cannot see any logout button. Call me those fanatic ones who don't like to leave sessions open but I would like to explicitly logout from the interface/service. Sorry if it's there but I can't see. Just started exploring about 20 minutes ago.

I have seen issues with non-logout sites in the past, so sugges you to place a logout button in case it is not there. Otherwise, I apologize for being blind.

Thanks

Inderjeet