Use bed:
Pull forward about 70 cm from the wall.
Gently pull the seat section up and forward. The backrest will already go down.
Then raise the seat section all the way up (you first hear two clicks, then a little more).
Then the seat section can be completely flat.

Using the bench:
Lift up the seat part (the wide part). Until you hear the second click.
Then gently push the part down/back (so that the backrest rises).

Note: folding in and out should be really smooth. There is no point in pushing/forcing it. Please handle with care or ask for help.