First of all,
Howdy and Welcome to iRV2.com
On your awning bag there should be what looks like a thick straw running the length of the bag. thats what attaches to the channel if you let the zipper hange at the bottom the straw looking thing should be on the top back side of the bag. I dont have my pop up available to take a picture of the bag for you. If you have that , a short screw at each end of the channel through the straw will hold it in place.