I don't know how to activate my chat screen. I enter a nickname that I want,but it says that I've entered the wrong nickname. Any help? I'm at my wits end.:e ek:>lol.

Are you using the nick brd#25? If so, I'm not sure that # is an allowed character in nicknames, try one without it.
If that's not the case, let us know what nicknames you've tried already and what the exact error message is.