A lot of people have asked this question since Dan popularized the phrase. Even though he has walked it back and now reminds everyone to not call it that, he still gives the same advice and I agree: You have to deny your dick the familiar stimulus until your brain forges new neural pathways.
That means you may have to go without orgasms for a while, but stick with it. Do anything but what you’re addicted to and your need to cum will eventually find a way. It is very, very hard to break some habits. Just keep trying until you make it.
Here are some relevant resources for you. Both should be helpful: