Can you post a picture of what you're doing? I have a guess, but a pic would clear it up immediately.
I suspect what you're doing is shoving the end of the fabric between the door and the surround, right? If you look at the door surround with the door open, you'll see a slot running vertically...the end of the fabric actually goes in THERE. So instead of fabric making a 90 degree turn between the door and surround, it makes that bend then another into the slot, so it's kind of a U-shape, with the prongs of the U facing toward the back.
Edit: Expect it to be a real pain in the arse the first few times. It took several tries in hot weather before my passenger-side actually cooperated all the way up to the top.
Utah Jeep Crew #148
No powerball here? How am I supposed to finance the mods?!?
'12 Sport...miss my YJ for all the wrong reasons though