Connecting to a private server is a simple procedure of editing your realmlist.wtf file. This can be found in your World of Warcraft program files. The typical path to this is C:\Program Files\World of Warcraft\Data\enGB\realmlist.wtf or C:\Program Files\World of Warcraft\Data\enUS\realmlist.wtf.
Open with notepad and and change the line marked:

Logon.wowge.com

And for easy we create special launcher for players. Download wowge_launcher.exe to your wow folder, we suggest you use the special launcher to run private server.