Folding the rear seat bench:
- Sit on the bench facing the front and pull the lever on the right.
- Then push the bench all the way forward.
- Fold the headrests backwards using the buttons.
- Pull up the loop between the seat and backrest, and fold down the back bench to the rear.
- Pull the mattress from the back to the front, over the bench, and you're done!
Straightening the bench
- Fold in the mattress back
- Kneel on the seat, pull the loop and pull up the back seat with the other hand
- Fold up the headrests and only then push the bench back into the desired position.
See the video here (minute 3:58):