The screw has a bit of blue on the threads.
You tighten the screw on the brake pad that is tight to the rim.
And you loosen the screw on the other side. Just a half turn at a time.
Squeeze your brakes a couple times. You can repeat again if needed.
Give your wheel a fling, and see if it still touches.
Easy to remember.... tighten on the side that is too tight.