You do not need to do anything extra to have your Instant Pot naturally release the pressure. This is a feature that it already does right after the cooking time has elapsed. After the time has elapsed the pressure cooked will beep to alert you that it has finished but if you don't touch or do anything the IP will turn to “keep warm mode” and the timer will start counting upwards to let you know how long the food has been cooking for. This is the natural release working and once the pressure has decreased enough, the lid will unlock and be easy to open.