Click and drag the mouse in the wave function (top) graph. The cursor
turns into a pencil. With the mouse clicked, ?sketch? any shape of a
wave function. After you have finished sketching the wave function in
the top graph, and have released the mouse button, the wave function graph
will automatically redraw, and the probability density graph will be simultaneously
sketched in the bottom window.

STEP 2: Finding Wave Function and Probability Density at a Point

After the wave function and probability density graphs have been sketched (Step
1), move the brown triangular cursor at the bottom of either graph horizontally
to the point of interest. The default position of the cursor is at
the center of the graph. The corresponding cursor in the other graph
matches it. As the cursor is dragged, along the horizontal axis of
either graph, the value of the wave function and probability density will
appear adjacent to the corresponding cursors.

STEP 3: Finding Probability Between two Points

Click and drag the two green triangular cursors to the two points of interest. The
program determines the fraction of the area under the probability density graph
that lies between the two points. This fraction is the probability of
finding the particle between these two points. The value of the probability
appears in the text box at the bottom left of the screen.