gas hook up for big red on Grand Design gas port

Thanks to Lakeland Bob for answering my question. I will follow your lead and try to figure it out.

To others, I apologize for not being clear with my question. Big Red in a gas fire pit not a grill, although from Lakeland Bob's comment it has a similar problem with hooking to the gas port. I use a grill with the small bottles and it works fine. Just wanted to eliminate hauling the extra cylinder for my fire pit if possible.