Insert a Phillips screwdriver into the hinge's top cover. Turn the cover to loosen it and then remove it from the hinge.
Position a flathead screwdriver in the slot located underneath the hinge cap. Push the flathead screwdriver down and turn it either left or right to increase or decrease the hinge's tension.
Open the gate and release it, allowing the closer hinge to pull the gate closed. Make any additional adjustments to the gate hinge, if necessary. Place the hinge cover back over the adjustment screw and use a Phillips screwdriver to tighten it in place.