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It's all about learning to relax at the right time and letting your body push it out while resisting the urge to help it along or clench. Diet and hydration also have a lot to do with how easily it can be done.
You also need to build trust in your diapers and get your subconscious used to the idea that its now ok to go in a diaper again.
Try starting by sitting on the toilet in a diaper when you need to go and move on from there.
You have to allow yourself to relax and let your body force it out of you. If you're having trouble try doing it while walking around. Often when doing that you just need a little push.