Our microwave oven doesn't work because the door latch tabs (2) on the inside edge of the door have been snapped off on the ends so the door cannot latch. We have located the part # for the 2 broken pieces (#4393913) and have found a supplier to order them from. However, we can't figure out how to open the door panel so we can install the 2 latch tabs.

Can anyone tell us how to install these 2 parts?
Thanks!