What's the proper way to level the refrigerator?

All four corners of the cabinet must rest firmly on the floor, the cabinet should be level at the front and rear, and the sides should tilt ¼ inch (6 mm) from front to back to ensure proper door closing and sealing. You can achieve this by raising or lowering the adjustable front rollers using a flat-blade screwdriver or 3/8 inch socket wrench. (Page 7)