1. Run Quasi88 once so that it creates the necessary folders.
2. Quit the app.
3. Acquire PC88 system roms (pc88 MESS roms will work) and place them in pandora/appdata/quasi88/rom
4. If you want the menus to be in japanese, skip to step 5. Otherwise, delete the roms that have the word kanji or kanj in their name. (Some games require the kanji roms. If the game doesn't load add them back.)
5. Load the emulator again and press F12 to load your games.