Drag the blue dots into a shape. I suggest you not make any angles that cut into the shape, i.e. interior angles more than 180 degrees. Next, press space.
I know, it's really REALLY slow, but keep in mind that 1) it doesn't even work properly yet, and 2) I literally made this during one lunch period. Also, for some reason it DOES NOT WORK with turbo mode. It's still really glitchy, and not complete. When I say glitchy, I mean ridiculously glitchy. I have a "repeat 10 times" script, but for some reason it goes far past that. UGH WHY DID THEY GET RID OF THE FLASH BLOCKS FUNCTION?