Can't change servers realmist server to this one

I've been trying to get this one. But I downloaded ******* wow WOTLK before going to this one. I've already changed realmist to logon.warmane.com and was able to save it but it won't take effect. I noticed though that once I open my WoW.exe it reads another part first then puts me back to ******* wow.

Edit:
There's also a patch4 on my downloaded from other site. Don't know if that helps.
And I'm on a FOTL not WOTLK. Can I play this for a WOTLK?

What is a FOTL?

FOTL is Fall of the Lich King Expansion. While WOTKL is Wrath of the Lich King.

That means 3.3.0? I don't think you can play using a client of a different version.