I have some that have a piece of elastic that slips over the top 2 corners. The first link below has the original instructions. https://us.v-cdn.net/5021717/uploads/FileUpload/7c/217967229dd8938d955b7565a0a14e.pdf https://tab-rv.vanillacommunity.com/discussion/429/window-awning-covers-shades
Here's what I did.. https://tabforum.nucamprv.com/#/discussion/6995/window-awning-design-clip It has never been windy enough for us to need the plastic clips, so we haven't used them yet. The pocket at bottom edge & elastic going across the top corners is all we've ever needed & they are easy to put on & take off.