Review the owner's manual to determine the location of the control panel or remote. Some models feature corded or cordless remotes with built in docking stations. Two person sleep adjustable beds have separate controls for each side of the bed.
Lie down in the sleep adjustable bed while you are holding the remote and make adjustments to the height of the head and foot areas by pressing on the up and down arrows that correspond. Make adjustments to the firmness of the bed to maximize comfort, if your bed has this feature. Choose settings that feel comfortable before laying still for at least five minutes.
Try out any other feature the bed has to offer so that you are completely relaxed into the adjusted form. Some models have programmable heat and massage sessions that will turn off automatically to allow you to sleep. Put the control somewhere visible and easy to find for the next adjustment.