How do I properly level the WAW285H2 washing machine during installation?

Use a bubble level to check that the top of the washer is level both side to side and front to rear, adjusting the washer feet as needed using a 17mm open-end wrench. Extend the washer feet no more than necessary, starting with the feet turned all the way in, as more extension leads to more vibration. Once level, lock each foot in place by tightening the locknut against the washer bottom, and press down on each corner of the washer top to confirm there is no wobble. (Page 17)