Remove the cover cap to the spring hinge with a Phillips screwdriver.
Insert the flat-head screwdriver into the slot in the top of the internal adjuster.
Press the internal adjuster inside the hinge down. Turn the adjuster either clockwise to increase tension on the spring or counterclockwise to loosen tension.
Open, then release the gate and watch it close on it own to test the tension on the gate. Continue to adjust the gate tension as needed.
Replace the cover cap and thread the cap screw back into the hinge.