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.

Thank you it works. When I think about it I guess my question was a pretty stupid one. I should have think about it a little bit longer.