Go to the main WoW game folder and go to Data/enUS/realmlist.wtf, 
if you have a different version it may be enGB or something else then go to this file i.e. 
edit it and change the realmlist.wtf file to this content:

set realmlist logon.molten.online

Then save the file and enter the game, of course, if you have already registered.

Registration: http://molten.online/register/

Change Email:
Please send me a private message on Discord regarding this matter, 
regarding changing my email address.

More Information:

A script has been added to Hearthstone to change individual information about a given character. 
Such as character name, changing faction.

With the free premium item you can teleport to Dalaran where 
NPCs are waiting for you that will definitely make it easier for you to play on the server. 
You can also teleport to the capitals from there using portals. 
The free premium item does not have a cooldown for teleporting to Dalaran.

Addons Wotlk 3.3.5a: https://github.com/devovh/Addons