When you loosen the seat screws tap them down to push the teeth out from the underside of the plastic. there is not a wingnut do not loosen them all the way. You can but it takes awhile to get them back in
The foam rectangles go toward the bow to push the bag back toward you. Then you get in the boat, open the valve, and push all the air out to make it hard and conform to your feet. The ideal would be to suck the air out once it is shaped the way you want it.
friend of the fork, knife, and spoon