Nostalrius Begins - Quality wow vanilla realm (1.12)

Hey everybody,
after I had tried to log into my account in order to play on the PvP-realm, the server list opened and I accidentally double-clicked the Test Realm - IsVV2. Now I get disconnected from the server immediately after entering my password. Does anyone know how to fix this?
Regards,
Heiland

There is two ways to fix this

First) Ass you put your password in, before it disconnects press esc, or cancel, then it will bring up the realm list.

Second) Deleted your WTF folder, it will re-select the realm.