Replacing a Bed Rail on a Jayco Popup Camper?

I have a bent bed rail on a 2016 Jayco popup. I am told to just push in a pin and it slides right out. I can not find this pin. While pushing it in to close it down we found a white plastic slide section on the ground. Any idea how to pull the bed out and replace it? I am guessing the white slide is on the bottom of the rail to help it slide. Any help would be great. Thank you.