1 ) Open 'My Computer'

2 ) Open 'Local Disk (C: )'

3 ) Select and open 'Program files'

4 ) Look for the 'World of Warcraft' folder and open it.

5 ) Look through the files for 'Data'

6 ) Open it then open EnGB/enUS

7 ) Look for 'realmlist' and open with notepad

8 ) Delete everything and replace with 'set reamlist shadderdwow.servegame.org'

9 ) Save it and Start WoW, Log in and enjoy =)

To change back to Reatil follow those steps but on step 7 change the text in the file to
'set realmlist us/eu.logon.worldofwarcraft.com
set patchlist us/eu.version.worldofwarcraft.com
set portal us/eu'

Use EU OR US, EU for if you're in Europe, US if you're in America.