Click the "Graph" button (this button also refreshes the graph).
To see two functions graphed simultaneously:
Enter the second function f2(x) in the text input field marked "f2(x)=".
Click (to its "on" state) the check box next to this input field.
Click the "Graph" button.
Example: f1(x)=ex and f2(x)=x2
Up to five functions can be graphed simultaneously.
To remove a function from the graph, click (to its "off" state) the check box next to the associated text input field and click the "Graph" button to refresh.
To erase the graph and all input fields, click the "Clear" button.