Nostalrius Begins - Quality wow vanilla realm (1.12)

So I finally got past the whole realmlist issue, only to run into another login issue. This time, it's telling me that my information is wrong and I need to check my spelling...Is the account we created on this forum not the same as creating it for the game? Do we have to register on another site somewhere? If not, what is the issue I am facing. I've tried entering it in about 15 times now, and still the same issue.

Please help