How to make a shelter out of a Poncho

What's up, Lynn! This video goes out to a friend of ours: The Wanderer down in Arizona.

All of our standard shelter configurations are constructed using square (10 x 10 or 13 x 13) tarps. For whatever reason, square tarps are kind of hard to find. So what do you do if you only have a rectangular tarp? How do you make said shelter if you don't have any trees for support?

https://usgiindustries.com/products/usgi-industries-military-spec-poncho-emergency-tent-shelter-multi-use-rip-stop-camo-survival-rain-poncho