This worked for me:
1. Navigate to the folder where Afterburner is installed.
2. Open up MSIAfterburner.cfg
3. Change EnableUnofficialOverclocking = 0 to EnableUnofficialOverclocking = 1
Hope this helps.
Ok so I've found the file and i found the .cfg. What program should I use to open it. I tried word but I dont wanna save it in the wrong format.