I assume you guys are referring to the post I made quite a while back (linked in my sig) or at least something similar. The trick is not to do a reverse kegel right before cumming, but to do a reverse kegel the whole time you're having sex/jerking off. And it's not so much a reverse kegel that you have to do, as much as just refraining from doing a kegel, because kegels brings the prostate gland closer to the base of the penis, causing more stimulation, and therefore, quicker orgasm. But like I said in my post, it may not work for everyone, because for many people I'm sure this isn't the reason for their premature ejaculation problems. For people for whom it is a problem, however, this could help a lot.
I'm not sure if I worded all of that clearly, let me know if it's confusing and I'll try to explain myself better.