Maybe I am the first. Yeah, the rear seat bottom pulls up on both sides at the front edge. I wasn't expecting the big bar across the rear and wonder if the FWD Cross has one. Anyway, the seat covers are going on now.
No bolts or anything, just pull up at the front on the left and right side, one side at a time and either side first. In the picture I put in the 2nd post, the two white oval holes at the front edge, that's where the seat clips push in. To reinstall, line up the tabs and hop on the seat. I weigh about 200 lbs. and it popped back in, actually went in a bit easier than I expected. My Rav4 rear seat was harder to get back in.