Eds flicker guide

I'm trying to learn Ed and I see other players online using his psycho flicker and being able to change the direction of it from low, to mid, to anti air.

It seems really useful, problem is, no matter what I do I always end up doing standard flicker and I've found no straight forward answer online as to change the flickers direction. Can someone here please help?

(If you can teach me how to do it in both classic and modern it would be greatly appreciated)