Thanks for the question!
Very simply you masturbate, but you do not orgasm.
More specifically edging is taking yourself right to the edge of cumming, hence the name, but not going over into climax.
For some they quickly get to the edge and then fall back by stopping or slowing down, but ideally, for orgasm denial, it’s most effective to learn to take yourself to that edge and try and keep yourself there for as long as you can, a few minutes at least.
As you practice doing it, you’ll more than likely go over the edge sometimes and orgasm. Don’t worry! This is meant to be fun. Try again!
And once you’ve got the hang of it, come back and ask about denial…