It is not possible to adjust the seat cushion from the upper position to the lower position. From the upper position, the seat cushion must first be fully lowered into the rear seat, and then folded up to the lower position.
Pull the handle forwards to release the seat cushion.
Press down with your hand in the centre of the seat cushion in order to lock it.
Check that there are no loose objects (e.g. toys) left behind in the space under the child seat's seat cushion before lowering.
Before the rear backrest is lowered, the child seat's seat cushion must be lowered first.