Place a sheet or several towels on the floor behind the dishwasher. This protects the floor and the dishwasher from damage.
Tilt the dishwasher on its back with assistance from a helper. Lower the back of the Frigidaire dishwasher onto the towels or sheet.
Remove the screws securing the lower service panel to the dishwasher with a Phillips screwdriver and pull the panel away from the unit. The service panel is the small flat panel below the dishwasher door. This is how you normally access the parts under the Frigidaire dishwasher once it is installed.
Adjust a crescent wrench around the hexagon foot of a leveling leg. Rotate the top of the leveling legs counterclockwise with a 5/16-inch socket wrench. The leveling leg unthreads from the hexagon foot and the frame of the dishwasher. Repeat for the remaining three leveling legs.