I was supposed to attach it to the seat post with a provided clip but I like to live dangerously so I attached it to the frame with zip-ties instead. The duct tape is there to prevent the frame from getting scratched and the grip tape keeps it aligned and from moving around.
Yeah this sort of DIY customization is a common theme on my bike. This fits right in. The fender itself has a duct tape “paitjob” too just like the rest of the bike.