The trays are not able to turn because there is too much weight on them. Try taking off some of the food in order for the trays to spin. This will also help the food dry faster, too much food on the trays will result in a longer drying process.
The Nature's TurnPrep™ only goes to 158 degrees Fahrenheit. The USDA recommends that most meats be cooked to 160-165 degrees Fahrenheit. In order to reach this temperature, we recommend flash heating the meat in the over, before drying.
In order to make the trays rotate the opposite direction, you will want to press down in the middle of the lid with your palm. You will want to change the trays half way through the foods drying time, this will prevent you from having to flip your food.
We recommend only putting 7 trays on the Nature's TurnPrep™. Adding more than 7 trays will add extra weight and could cause the trays to no longer rotate or even burn out the motor.