If it is play between when you turn the steering wheel, and when the tire actually turns then yes there is an adjustment, the play may not be in your box. So first investigate, making sure you have no broken or wore front end parts, if everything checks out okay, then there is an adjustment on top of the box. First jack up the front, so the wieght is off the tires, then back off the nut that locks down the screw, this located on top of the box, can be seen by looking straight down by the power steering pump, once you have loosened the nut you can tighten down on the screw, do this slowly, not to over tighten, if you tighten too much, then you can damage the worm gear inside. Once you are down tightening, then lock it back down. Keep in mind that play in the gear box is a sign of wear, and the box may need to be replaced.