There are a few things you need to do in order to dunk in 2k16 on PS4. First, make sure you have the right equipment. You will need a ball, some water, and a hoop. Next, practice! Dunking is one of the most important skills you can have in basketball, and it will help you improve your overall game. Finally, be sure to stay consistent with your dunking. If you start doing it inconsistently, it will eventually become second nature to you and you will be able to do them with greater ease.