I actually go on this forum with one of the computers of my high school and I'd like to know how to force the user to type his password each time he wants to log in because I don't want an other guy to write posts (and certainly bullshits) using my name. I'm actually logged in automatically when I come on the site (I use the adress that refers to the 'Home' page). I must have missed an option the time of my first log in.
Up in the right of the screen is a logout button. Click on that. Then hit the login button in the upper right (by where the IM option would be). It asks for your username and password and also asks you how many minutes you want to be logged in and if you want to always be logged in. So, you can set it up how ever you want there.