How do I adjust the rinse agent dispenser?

To add rinse agent, open the dispenser and pour liquid rinse agent on the arrow until the reservoir is full. Wipe up any excess rinse agent that puddles. To adjust the amount of rinse agent dispensed, turn the arrow to your desired setting. Always use a liquid rinse agent even if your detergent contains a drying additive, as proper drying requires it. The indicator light will go out in a few minutes after closing the dishwasher door. (Page 15-16)