Here's full instructions:
1. Go to your Mac HD/Applications folder and move your World of Warcraft to the Trash
2. Go to your Mac HD/Users/Shared folder and move the Blizzard folder to the Trash
3. Go to your Mac HD/Users/your account/Library/Preferences and delete any files associated with WOW:
(You might not have all of these files.)
- com.blizzard.downloader.plist
- com.blizzard.Downloader.prefs
- com.blizzard.errorreporter.plist
- com.blizzard.Installer.plist
- com.blizzard.launcher.plist
- com.blizzard.World of Warcraft.prefs
- com.blizzard.World of Warcraft.survey.prefs
- com.blizzard.worldofwarcraft.repair.plist
- com.blizzard.worldofwarcraft.plist
4. Empty Trash