How to replace license registration light on a Lincoln Town Car?

[bodyrockinmodelsv3]

Have a 1999 Lincoln Town Car Signature series, how do I change the light for the rear license plate, saw it had to screws on that I took out but the cover still did not just pop off?

I didn't want to pry or etc if there was some other trick to getting to that bulb or two bulbs how ever many is in there.