How to Write Script to Make a Ball Move

I am using The program from Khan Academy 
here is a link to it
http://www.khanacademy.org/cs/new

To make the background color  simply type          background(0,0,0)
to change the color click on one of the zeros and  you can click on what color you want

To create the ball you need to type        ellipse(0,0,0,0)
the first  two zeros control where its placed on the page  aka the x and y axis
the second two zeros control how big the ball is
to control what color the ball is  put your cursor infrount of ellipse and hit enter  then go to the space above your ellipse and write fill(0,0,0)
it is the same way to change the color as the background

it should look like this
fill(0,0,0);
ellipse(0,0,0,0);

Tip: make sure you always have a semicolon ( ; )  after every command you type
     

you need to make a variable for the first  zero of your ellipse
type  var x = 17

How to make the movement of the ball
type                   var draw=       
2 brackets will come up copy and paste everything  in them except  the var  x = 17
 then at the bottom of the brackets (still inside the brackets) put
x = x+1
now your done you can see my creation on this link
http://www.khanacademy.org/cs/ball/1363117122

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