Take off all the trim panels that cover the area where the cap bolts to the body to expose the bolts holding it on. Then remove the bolts & top. I mean, that's essentially what you'll need to do
/emoticons/
[email protected] 2x" width="20" height="20" /> Being a 96' you'll have to also deal with the 3'rd brake light and the rear seat shoulder belts. For the brake light you'll want to do something like cut the wires & install spade terminals or a harness connector so you can plug & unplug the things when you remove the top. The only options I know of for the rear seat belts is to either move the anchor points over to a roll-bar (IF you have one, which most don't), get a second seat from an earlier lap-belt equipped Bronco or just don't carry passengers back there without the top (and of course there's always the fourth option of just letting people takes their lives in their hands when riding with you but insurance companies & law enforcement types generally frown upon that)
Some caps DO leak after being removed but that's generally because someone damaged or screwed up the gasket when re-installing the cap. The gasket is very robust and in 9 Bronco's I've never had a single cap leak. I only mention it because I *have* heard complaints but to be honest they were very few, it's an uncommon problem so I have to assume the guys with leaks had some sort of problem reinstalling the cap and somehow damaged the seal. It's not something I'd even give a second thought to. Even if you DID manage to generate a leak it wouldn't be very difficult to remove the top, run a bead of silicone around the gasket & reinstall the cap.