From the Ford manual:
Weatherstrip Adhesive E8AZ-19552-A or equivalent meeting Ford specification ESB-M2G176-A is designed to hold weatherstripping to the body.
You can adjust the U-latch on the doorframe (not the door itself) to make the door seal /close more tightly.
If it only has a gap at the top of the door, put the window down all the way. Sit in the seat with the door ajar, with you facing out the door. Grab the top of the door, put your knees on the door for leverage, and PULL the top of the door toward you.
Do this in increments, checking often. It takes quite a bit of strength, it being made of steel and all.