Use flat end of a spudger to pry up the EMI shield, starting from the top edge near the front-facing camera.

In addition to screws and mild adhesive, the shield is also secured with clips along the outer edges. Try to bend the shield as little as possible when removing it, so you can bend it back to its original shape and re-use it. During reassembly, it should snap back into place once the screws are tightened.

Continue carefully prying up the EMI shield until you can remove it.