How do I fill the rinse aid dispenser?
Open the rinse aid dispenser lid by gently pushing in the center of the lid with your thumb and pulling up on the edge. Pour rinse aid into the opening until the dispenser is full, being careful not to overfill, and then push down gently on the lid to close. The dispenser holds 5 oz (150 mL) of rinse aid, which typically lasts 1 to 3 months under most conditions. Clean up any spilled rinse aid, as it can create excessive suds. (Page 7)
From the official Whirlpool Dishwasher manual, page 7
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