Be sure the device is powered off. Clean the device to prevent any dirt and dust from entering into the device.

Use the plastic opening tool to gently pry the plastic screen frame away from the screen. Run the plastic opening tool along the interior edge of the screen until the screen frame is completely separated from the glass.

The screen frame is held onto the Nook by a set of tab that run around the outside of the frame. There may also be a line of rubber cement around the Nook under the screen frame. If your Nook has this, you will have to dig deep to separate the frame from the Nook.