Does anyone know how Frodo WII works?

I have it booted up all fine, but the .d64 rom i'm tryin to play (simpsons arcade game) is 3 disks. I have absolutely no idea how to load it up in the program. Which disk do I select, and then even after you highlight a .d64 file of one of the disks theres ANOTHER sub menu of a huge list of different files to choose from to either "insert" or "start"

I have no idea what is going on or why I can't just choose the rom and load it up. Anyone wanna help me out here? :D