Remove the screws that secure the bottom panel of the dishwasher to the appliance with a screwdriver. Remove the bottom panel.
Locate the water inlet valve. On Whirlpool models, the water inlet valve is located on the left side of the lower compartment of the dishwasher.
Thread the water supply line connector onto the brass elbow then hand-tighten the connector. Use an adjustable wrench to further tighten the water supply line.
Turn on the water supply valve and inspect the connection for leaks.
Replace the lower access panel and secure it into position with the screws that were removed.