Don't have any pictures but have done it many times. Unlatch table, slightly lift both hinged bench cushions and then push down tabletop so it rests on the edges on the front of the benches. Lower both benches. Now take the two rectangular filler cushions you should have received and place them on top of the tabletop between the bench cushions. It will be a snug fit.
When my older grandson wants to sleep there I remove the two back cushions to give him more length. My younger one fits leaving them in place. I also have a memory foam topper I lay on top to make the small gaps in the cushions go away. We have two twin-sized flat sheets we use to "make" the bed, but the last trip they had a sleeping bag they just put on the bed.
If you need a picture I can send one tomorrow, camping in Boothbay, Maine and can get the filler cushions out tomorrow and snap a picture.
2014 Seneca 37TS
Toads: 2014 Ford Explorer Sport or 2013 Ford Focus ST