Hi-Ya, dbr5010,
I don't know which model of Jeep you have or which brand of soft-top, but
on my CJ with a "Bestop" soft-top there is a retainer bar that snaps into the two corner pieces of the body lip soft-top retainer.
The bottom edge of the soft-top rear window then slips into a slot on that bar.
I will try to take and post a picture of the rear window retainer bar setup tomorrow.
Regards,
Gadget