Instructions
Turn your PlayStation 3 around so that you can see the back of the console.
Insert one end of the USB cable that came with your USB DVD drive into either of the two USB ports on the back of your PlayStation 3. These two USB ports are located directly beneath the "Power" button.
Insert the second end of the USB cable that came with your USB DVD drive into the input on the external drive itself. Your USB DVD drive is now connected to your PS3.