Joe, post some pix of what it is you have the question on.
Guessing now - once on there is a space / gap between the soft top and the verticle edge of the window frame? Am I correct this is the question? If I am, to best fit, with the top on, start in the late afternoon when the top has had a day to warm up, from the rear corner slowly pull the top towards the front. You should gain an inch or so as you progress. That should get you all that you can. From there - if not happy, post a pix to show waz up.
Another thing, months ago Yousef posted a fix it to hold the soft top tighter. Do a search and it will pop up.
And finally, which Chris? I am looking for help with the rail system on a 1994 d-90.