Instructions
Connect your Action Replay device to your computer via the USB cord that comes with the device.
Start the Action Replay Code Manager software that comes packaged with the Action Replay device. The device will automatically detect your connected peripheral.
Right-click inside of the "My Codelists" panel at the bottom-right of the screen.
Click "Add new game." A small window will appear.
Enter the game's ID (YB3P-8E8BAC0B) into the box and give type "Harvest Moon: Sunshine Islands." Once finished, click "Add." This will add "Sunshine Islands" to your list of games on Action Replay.