Tighten/loosen the tension adjustment screws on each the caliper arm to adjust the resting distance of each brake pad, so that each pad is equally distant from the rim. Tightening the screw will shift the caliper outward from the bike, loosening it will shift it inward.

Tighten/loosen the brake adjuster on the handle bars such that when you clamp down on the brakes, the brake lever stops before hitting the handle bar. This will set the distance between the brake pads and the rim.

Tighten the lock nut on the brake adjuster to permanently set its position.