...
If using the USB connected disc drive, plug it into your computer (the remaining steps are the same for either drive).
Press the small rectangular button on the front of the drive and it should pop open.
Place the disk label-side up on the tray, matching it up with the circular part of the tray.
Close the tray until you hear it click shut.
Proceed to the proper imaging and transfer section (link) for how to transfer the actual files.