Panasonic FZ-G2 Series Operating Instructions Manual page 23

Using the pen (included)
We recommend placing the pen (included) perpendicular to the screen surface when using it.
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Press the pen's tip on the screen surface, and use the pen.
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"Touch and hold" ("right-click") operation
Touch and hold the object with your fingers, or the pen (included), and release it when a flame surrounding the object appears.
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Press and hold the button (A) of the pen (included), and then touch the object.
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"Eraser" operation with the pen (included)
Press and hold the button (B) of the pen (included), and then touch the object.
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Operation by touching the screen
Instead of operating the screen with the pointer, you can use your fingers.