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Directions for Adjusting the Herman Miller Ambi Chair Arm Height. Use the small lever under each arm pad. To raise or lower arm: While seated, pull lever laterally all the way out. Raise or lower arm to desired height (there are seven stop-points). Release lever to lock. Arm Angle. Use the small lever under each arm pad. To adjust arm angle: While seated, pull lever laterally out to midpoint. Pivot arm in or out (there are four stop-points). Release lever to lock. Back Height. Use the button under right side of back cushion. To raise or lower back: While seated, press button in. Raise or lower back to the desired position. Release button. Seat Height. Use the lever on right side. To raise: While seated, take your weight off chair, lift lever. To lower: While seated, lift lever. Seat Depth. Use the lever below seat cushion on left side. To move seat forward or back: While seated, pull lever out and hold. Slide seat forward or backward by shifting your weight. Release lever to lock position. Tilt Tension. Use the knob under seat at front of chair. To increase tension: While seated, turn knob to the left. To decrease tension: While seated, turn knob to the right. A number of turns may be necessary to get the desired tilt resistance.