Gently insert a plastic opening tool, near the volume control buttons, between the plastic surround of the screen and the metal case.

Rotate the tool away from the Touch to pry up on the glass panel.

The key is to work slowly and gently to avoid breaking internal components.

If you are having difficulties using a plastic opening tool. You could try a razor blade, we found it easier to release the clips with one. Please be extremely careful if you take this route!