How do i stratum the washer and dryer?

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There are adjustable "swivel" foot on each appliance. Adjust them by lifting the washer/dryer up (slightly) and turn clockwise or counter clockwise until the appliance is level. (It's usually one and only necessary to adjust one, maybe two, of the foot.

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Most washers own automatic levelers in the rear of the contraption. to adjust the back.

Get a level and place it on the washer front to posterior. If the bubble is not in the center, raise the front or rear to see which needs to be adjusted. If it's the front, lift up it slightly and screw in the leveling feet (or unscrew them as the shield may be) until you have it level.

See also the directions below.

Place the plane on the front of the washer, left to right. Adjust the front feet until the bubble is within the center.

You may pull the washer toward you (both rear foot off the floor) and the self leveler will adjust the rear.

The dryer across the world has screw adjusting foot at all four locations. Follow the leveling directions using the level as above but you will also stipulation to level the rear and both sides of the dryer.
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Answers:    There are feet at each corner which can be screwed within or out to adjust the level. Usually can do it by hand but sometimes may want a pair of pliers or a small adjustable wrench. Level front to rear and side to side.