If you are not familiar with how to set realmlist it is very simple and I will guide you in these short steps below

1.Copy > set realmlist warhammer.servegame.com
2. open your Warhammer wow folder > Data > enUS
3. Open realmlist with a notepad.
4. delete the info in there and paste step one into folder.
5. save and close and you should now be able to play on the warhammer lichking server.