There are 6 bolts that hold the bars to a set of 2 black brackets on the sled. Do not use the bolts Frabill sent you, they will come loose as they are barely long enough to catch the nylock washers. Go spend $2 at the hardware store and buy longer bolts.
Also, take your windows out before you put the shanty down. If it's cold, they break easily.
One last thing, put your Hyfax kit on before you assemble the shanty. I did it the other way around, huge PITA.