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PD or Pupillary Distance is the distance in millimeters between the center of one pupil to the center of the other.

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Stand in front of the mirror around 8 inches away and hold the millimeter ruler on top of your eyebrows.

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Look straight then close your right eye. Align the "0" of your ruler to your left pupil's center.  

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Use your right eye by closing your left eye. Take the measurement (in mm) that you see above the pupil of your right eye.

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Note: For accuracy of your PD measurement, it is recommended to repeat these steps at least 3 times.