Turn the Laptop over, and with the metal spudger start to run it along the plastic seam to pry it off.

You will hear popping sounds when you are sliding the spudger along the device.

For an easier removal, start from the sides and work your way in to the corners.

Be careful when using the metal spudger as it could cause damage to the internals of the device. Don't push the spudger too deeply into the seam.