I guess you're trying to get the feet out.
I tried to take the frame out but couldn't. It's in a lot tighter than it is with the legs.
I got the feet off though.
What I did was take a thick bit of wire, bend it, and push it into the slot that appears when you bend the frame over. So when the frame is bent over a slot appears at the back between the frame and skirt. You can use something like wire or any reasonable strong curved thing and push it into the slot. The peg holding the legs in isn't that strong and the legs pop out.
The wire I used was from an old electrical cord and is about 1.2mm thick.
Slot is about 2mm high so any wire around 1- 1.5mm would work. A trimmed bit of plastic would probably work too.
I'll add that I just pushed into the general area of the peg and it pushed the feet out. It does take some finger strength, just did it again to make sure it works each time.