Need help fueling

Its a push latch.
push the fuel door in to open, push the door in to close.
Also, there is no gas cap.

Also, there is a special fuel filler nozzle hidden under the trunk carpet just behind the driver rear seat (fold down the rear seat to access). You need that if you ever need to add fuel from a gas can.
I just accidently discovered this feature watching a Lincoln online video.

I think it has an anti-siphon device built in, which is why you don't need a separate gas cap.