Bring yourself to the point of orgasm any way you like repeatedly. This can last as many hours or over a period of days if you like. You can enhance the experience with porn, vids, mags, toys or whatever you prefer.
The point is to get as close as possible and just keep it there as long as you can and then stop if you must for a few seconds or minutes and just keep at it.
I have done this for hours at a time and then don't cum. I will start up the next day and have gone for several days using this method.
I produce tons of precum and even leak some actual sperm when I get to close.
I have learned using this technique that I can actually have multiple orgasm and release my cum over 7-9 sperate times before I am empty.
I have brought myself to the edge over 1,000 times without letting myself cum (I stopped counting) but I usually only wait a few hundred times. This can really make your balls wonderfully sore. I use a cock ring to really make my cock extra sensitive and all my veins buldge out like they are going to burst.
Edging is not restricted to men; women can do the same thing... without the sore balls and precum I guess. lol!