Practice this a lot because it is used in a lot of different tricks.
1.Start in this position...like you are flexing.
2.Throw the yo-yo to your side, swing the yo-yo in front your body in a circle-like motion.
3.As the yo-yo swings around, let the string wrap around your pointer finger of your non yo-yo hand, about 5 inches from the yo-yo.
4.Catch the yo-yo on the string and let it spin. Exit the trick by pulling your hands away from each-other, and catch as it comes toward your hands.(The best yo-yo for this trick is the Butterfly.)