Nostalrius Begins - Quality wow vanilla realm (1.12)

I accidentally clicked on the "Test Realm - Isvv2" and I immediately disconnected. Now every time I log in, it always disconnects me... Anyone know how to change your realm without actually logging in?
Cheers

Delete your WTF and it should set it back to default, and it will bring up the "realm selection" thing

Hope that works.