How do you register for a RSC Private server... or somthing idk..., It says "INVALID PASSWORD OR USERNAME PLEASE TRY MAKING A NEW ACC" on every RSC P SERVER i go on...
you have to make an account on the site running that specific private server.
most of them require an account for the forum, then you have to go to profile up the top and make a character for the actual game.
hope this helps.