Fuel filler door release buttons were added to the Ford Escape, but not until later model years. Then, with 2020 and later models, the button was phased out again—on these doors, you’d just press in on the door to cause it to pop open.
If for some reason you can’t get your fuel door to open with any of these methods, it’s possible it could be stuck shut. In that case, you might want to enlist some help from a Ford dealership or auto shop to avoid potentially damaging the door.