Dishwasher Detergent Ratings Where Do I Put The Dishwasher Detergent?

Where do I put the dishwasher detergent? - dishwasher detergent ratings

I have a KitchenAid dishwasher, fairly new, about 2 years. It has 2 compartments in the door, it's just a rectangular pan with a lid that fits, and the other with a little arrow that is a 5-position and also has a cover that can snap again.

What can I pour the detergent? And I have nothing to put in the other?