How do I fill the detergent dispenser?
Open the dispenser cover by moving the cover latch to the right. Add the correct amount of detergent to the Main Wash section according to the water hardness and soil level chart. If using tablet detergent, it must be placed in the Main Wash section. Add detergent to the Pre-Wash section if needed according to the chart. Close the dispenser cover. (Page 11)
From the official Whirlpool W10021620 Built-In Dishwasher manual, page 11
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