Nostalrius Begins - Quality wow vanilla realm (1.12)

Hey
Im total new to this vanila server so dont kno that much about it but i just downloaded Nostalrius and i did follow the starter guide. But when i try to login it says ''the information you have entered is not valid'' and im 100% sure that it is but i dont kno if i need the normal wow downloaded cuz my brother says i dont need normal wow.
So i dont know what to do so pls help me

What version does the login screen show in the bottom, left corner? It should show 1.12.1 dated for Sept 2006.

Also, did you register a game account separate from your forum account here?

It does say 1.12.1 sept 2006
And a game account where do i make that?

I fixed it i just reinstalled ever single thing and then it worked