See attached manual for the 240-SD01 Conquer Standing Desk.

To raise/lower the desk, please be sure that each of the levers on either side of the rear of the desktop are both in the "Unlocked" position. Then grasp the sides of the desktop with your forearms to raise or lower it. It sort of "glides" down, it doesn't lower straight down so apply pressure downward and away from your body until it is at the pre-set level you would like (there are 5 levels including all the way up, and all the way down) then move levers to "Locked".