in light of recent imposterisms, there is now an optional user name registration link at the top of this page.
basically, you pick a name and a password. when you enter both the user name and your password when you post, you name is underlined. so, if some jackass pretends to be you, you can reply with an underlined name and call them out, etc etc.
you don't have to use your name every time or ever, if you wish. i'm just giving everyone the option.