i can't make a guide for some reason so ima just post it in threads.
How it works: When u jump off a corner in the 4th frame your character will be in the air then you have to tap jump again (very fast) and after 3 frames your character will do another jump in the air.
Edit: You don't have to jump off a corner you can do it everywhere but you have to be moving because if you're staying still and do the same steps it won't work (for some reason).
How to do it: Spam. Very, and i mean very fast.
Sorry for my long absence, but I'm back now!
Many thanks to zalex for getting stuff going again whilst I was gone, I just didn't have the time nor energy to moderate or deal with questions in my situation.
I'm gonna try be here and the discord as much as needed now I'm free~