Issues logging on

Hey im trying to get started playing I just downloaded the game WOTLK 3.3.5 off your website but it just says log in error please see blizzard site blah blah blah. I checked the realmlist and its this one set realmlist logon.warmane.ru

I tried putting in the one you have on your website but it says realmlist file is read only. What do I do? Is the realmlist the issue or whats going on?

I have figured out how to make it not read only however it still says unable to connect. Not sure what to do now...