To graph a function you have too use Reverse Polish notation.
example x 2 ^ is the same as x^2
spaces denote separate items 
ie. when the program comes across a space it pushes all the proceding stuff onto the stack and sets the Holder varible to 0.

here's some more examples of equations 

x 2 * = 2*x
x 2 ^ 2 * = x^2*2
x 3 ^ x 2 ^ - = x^3-x^2


When you click the value button the program will give you the Y value for the X value thats in the X Value Box.

This is my first Readme so if you can't get it to work email me at Bjwbell@netscape.net