Nostalrius Begins - Quality wow vanilla realm (1.12)

Im pretty dumb when it comes to finding where to report things online on wesbites and everything so not exactly sure. I've created an account and instealled the game i use the login credentials i have for the website and it just keeps coming up with "The information you have entered is not valid. Etc..."
It's been a few days now so i thought i'd eliminate the "wait" factor.
Please help