When you wanna join server you must find Realm list and edit it
EU:
your realm list look like this
||
\/
set realmlist eu.logon.worldofwarcraft.com
set patchlist eu.version.worldofwarcraft.com
set realmlistbn ""
set portal eu

you need to change it to:
||
\/
set realmlist fire-blade.servegame.org
set patchlist eu.version.worldofwarcraft.com
set realmlistbn ""
set portal eu

You must open it whit notepad or it wont work
your realmlist is at:

C:\Program Files\World of Warcraft\Data\enGB
OR
D:\Program Files\World of Warcraft\Data\enGB

Please fix it a little. Put some colors to see the difference and so on. Its annoying to read like that. And step for step.

I done it is now better ?