How to properly do the squeeze method?

I'm a guy. Just trying to cure his ED and premature ejaculation.

So I'm confused on the squeeze method. I saw it on the FAQ. Problem is I don't really understand how it's done.

How I'm doing it right now is middle and pointer finger underneath my penis but below the head. The thumb above my penis and below the head. And then I'm supposed to squeeze? It doesn't really work though.

I can stop myself before I go over. But if I don't that I don't "edge" at all. If I go until I'm about to cum squeeze doesn't stop the contractions which eventually makes the cum come out.

Maybe I'm just doing it wrong. Or maybe there's a better way to stop being premature and get actual erections.

By the way, for anyone who's tried, how useful did you find exercise in curing your ED?