Your login for the message boards is the same one for the chat room.  But you must log in separately to join the chat rooms.  I think that's because it is a different software platform.  So just because you're logged in here doesn't mean you don't have to log in again for the chat room.

There's a small box to the right side of the screen when you try to enter the chat room that says login.  You might have to scroll to the right, depending on how large your font is or your screen size.

If you are having trouble with THAT login screen, then there's something else wrong.  You would need to notify the admin about that.

Hope this works for you.

Oh, and there's rarely anyone in the chat rooms except in the evenings, usually between 7-11 EST.