Ball Code

I am yet to figure out how to change the color of the ball when bouncing of the edge, but I did manage to figure out the current which was getting the ball to move at all. I just simply had to fix a letter error for the color value. After doing that it was a matter of figuring the out the format for yPos. So I tried to use the same format for the xPos, but nothing happened. Maybe I don't have to put in that bSize equation, since my ball was already moving without it. I don't know whether I'm missing something or I need to add something.