Nostalrius Begins - Quality wow vanilla realm (1.12)

I selected the player test realm. Got disconnected. Now I can't log in at all because the player test realm is the default server.

What do I need to delete to fix this?

Hit escape really quick after you log in, or delete the realm name line from the config.wtf file

thank you. was looking for the server in the file but couldn't find it at first