Turn the table over on its top. Set it on the floor or ground.
Pull both legs out and up until they are fully extended.
Move the locking ring on each leg section down until it won't move any further. The legs should securely lock into place.
Position one person at each end of the table. Instruct each person to grip the bottom of the upper sliding sections on the legs and pull up or down on them at the same time to adjust the height.