260E 1987 (how to put the rear seat back?)

[throne7]

1987 260E W124 model.

I pulled up the rear seat at the back of the car, so I can have a look at the vacuum pump & convenient module, because I plan to hook up a keyless module (so I can open the car door with the remote keyless control). Anyway, I pulled the two red tabs on each side of the seat bottom, and the seat was pulled up effortlessly. However I can't seem to
be able to position the padded seat back in place so that I will lock to the
two red tabs again. I just wanted to take a look at the wirings. How can this seat be put back? Thanks in advance.