1. Make backups of WTF and Interface folders (copy them to the desktop)
2. Extract the interface folder to the World of Warcraft folder (if it asks to overwrite say yes)
3. Extract WTF folder to the World of Warcraft folder (if it asks to overwrite say yes)
4. Go into WTF folder, then into account folder, and rename the "YOURACCOUNTFOLDER" with the name of your account (BEEFJERKY333)
5. After renaming the "YOURACCOUNTFOLDER" go into that folder and rename the "YOURREALM" folder with the name of your realm (Arthas)
6. Go into the "YOURREALM" and rename the "YOURCHARNAME" folder to the name of your character (Darths)