While you hold this position, your skis will follow your "point" and will turn to the right - this is because of their shape. With your direction moving to the right, bring your right arm back to a comfortable straight stance. You can go into the snow plow to stop, or you can continue a right turn across the hill to let the hill slow and stop your descent.
To initiate a turn to the left by pointing, start down the hill again with your skis shoulder-width apart and flat on the snow. Raise and extend the left arm again, and let your head follow your hand until your head is over the left ski and slightly forward toward the tip.