How do I fill the rinse aid dispenser?
Make sure the dishwasher door is fully open. Turn the dispenser knob to 'Open' and lift it out. Pour rinse aid into the opening until the indicator points to 'Full,' being careful not to overfill. Clean up any spilled rinse aid with a damp cloth and place the knob back into the opening, turning it to the 'Lock' position. (Page 12)
From the official Whirlpool W10021620 Built-In Dishwasher manual, page 12
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