How do I properly level the washing machine after installation?

Place a level on the top edge of the washer side-to-side and front-to-back. If not level, prop the front with a wood block and adjust the feet, then prop the back and adjust feet as needed. After leveling, use a 13 mm wrench to tighten the nuts on all four feet firmly against the washer cabinet. The washer should not move when pushed on its top edges.