Starting the game, you will have the following options:

Hotkey + [START]  - Retroarch Settings
Hotkey + [X]      - Reset Game
Hotkey + [Y]      - ON/OFF Fast Forward
Hotkey + [A]      - Save the Game
Hotkey + [B]      - Download Save
Hotkey + [C]      - Exit to the Main Menu
Hotkey + [LEFT]   - Rewind
Hotkey + [RIGHT]  - Fast Forward (Hold)
Hotkey + [UP]     - Increase Volume
Hotkey + [DOWN]   - Decrease Volume

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Enabled Quick Menu Options:

Rewind
Cheats
Shaders