OK REALLY SORRY FOR THIS FOLLOWING POST
My camera doesn't work and I'm and gonna ask my mom to use hers when she gets back but I am gonna try to explain this with picture i found over the internet.
Ok the part of the ball you are going to use is where it says Offcial League(and the sides of the ball) You touch ONLY the leather and not the stitches.
Ok pay attention to the right side of the picture where the R is. You see how the thumb and pointer finger make that U shape? Thats the grip you are going to be using
Ok the only thing this picture is important for is you want to hold the ball from the bottom like this. Now take the U grip you formed and put the bottom of the U over the Offical League symbol or w/e your baseball says and grip the side of the baseball's leather with your fingers. Your entire U shape will be covering the ball and there will be no space between your hand and the ball like in this picture.
Throw like a Fastball with no supinating or anything (BUT you can supinate or pronate to your hearts desire if you really want too. You might actually wanna try it)
Ok I will try to get some valid pics up later and edit this post but until then I hope this helps. And sorry about these pictures I did try tho.