How do you trow a curve ball?

At the part that looks like a horseshoe, with your index and middle fingers together, put them on the right side if you're a righty, left side if you're a lefty. Go into your wind up, and instead of throwing it like a fastball, have the top of your fingers facing up. When you have released the ball, the top of the fingers should be facing down. This happens when your fingers go 'over' the ball. I have found it that the sharper your fingers go 'over' the ball, the more it will break. If your arm hurts while throwing it, you should stop throwing it for a while and rest. A good way to rest your arm is to ice it where it hurts.