Ouch, a one piece roof. Not sure you will ever get the wrinkle out of the top. If does not look that bent from the picture. Does is close tight? If it does I would just put a little sealer where the trim has pulled away, the soft side is just behind the trim.
Unless you want to tackle a big job you might want to talk to FWC if you want it perfect again. Trim would have to come off, soft side pulled off in the area and inside pulled off to get any backing behind the top to try to straighten the wrinkle.