1. Download World of Warcraft client if you don't have it.
2. Create a new account (here).
3. Go to "../World of Warcraft/Data/enGB/realmlist.wtf" or "../World of Warcraft/Data/enUS/realmlist.wtf" file.
4. Open realmlist.wtf with Notepad or any text editor.
5. Replace the text inside with SET realmlist "logon.stormgarde.org" then save.
6. Start the game using the WoW.exe in your World of Warcraft folder, login and play!
7. Log in using your account name, not email address.