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First, click on the sketching tab, , which is located underneath the "Tree Outline". Next , click on the rectangle button, , and draw a rectangle somewhere above the x axis in the top right quadrant of the XY Plane as shown below.
Next, click the line button, , and draw two vertical lines that connect the bottom left and the bottom right corners of the rectangle to the x axis. Remember that a "P" should appear when the mouse is directly over a rectangle corner and a "V" should appear when the line your drawing is vertical. Lastly, make sure that a "C" appears before you click on the x axis to terminate the line segments. You should now have an image comparable to the one below.
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