1. Extract archive Frets on Fire Rack Band Edition.rar.
2. Obtained folder Frets on Fire better placed in C: / Program Files /
3. Go into the folder Frets on Fire -> then go to Folder Data
4. In this folder create a new folder Songs (not to be confused with the existing folder Sounds)
5. Open folder Rock Band Songs and copy all the folders created songs in a folder Songs
6. Start the game, go to Settings -> Songs List Settings -> Select Songs Library -> enter the Songs created a folder and click Accept Folder