First of all register at http://wow.superhclan.co.uk/en/ -> http://wow.superhclan.co.uk/en/account/agreement.php
then you go to your WoW folder(prolly at C:/program files/World of warcraft)
there you will see"realmlist wtf"
open it with wordpad,word,...
then you delete EVERYTHING in it and put in there set realmlist 82.32.137.31
then join WoW and you should be in SuperH WoW
PS:2.4.3 can't connect 3.0.3 and 3.0.3 can't connect at 2.4.3