Casio V-N500 - Manual (Page 193)

E-191
2. Insert the battery with the positive (+) terminal towards the tip of the pen.
3. Turn the cap clockwise to secure.
Using the Digitizer Pen
Tap: Lightly touch the tip of the pen against the touch-panel.
Sketching characters and lines: Sketch characters and lines by holding the tip of the pen
against the touch-panel and sliding it lightly over the surface.