Take the spudger and insert it between the screen and plastic frame

Tilt the spudger towards you until your hear a click, this means that a clasp has been released

Do this process along the right side, going up, across the frame, and back down to the left side.

To be sure every clasp has been released, try gently pulling the top of the frame towards you. If frame does not come away from the screen, then there are still claps connected.