Problem changing server

Hi, resently when i try to log in, the game automaticly goes on a different server then i usually use, and when i try to go back so i can change server, it only logs me out of the game.

I even tried to make a character so i could change the server from there, but it says that ''i can't make a character'', and that ''i have to try again later.''

sooo, to sum up everything: i can't play the game...

open your Cata folder > WTF folder > config.wtf , open this file there should be a line like this:
" realm name Warsong".
Delete that line