changed to test realm can't connect now

Good evening.
I changed to test realm to see what it does but i got instant disconnected.
Now i can't go online to change my realmlist so i can play.
any possible way to fix this please
thanks
I changed to test realm to see what it does but i got instant disconnected.
Now i can't go online to change my realmlist so i can play.
any possible way to fix this please
thanks