Pin Usage for MiniAmp other than GPIO

My application requires that the GPIO Headers on a Pi 2W remain accessible, so I want to use dupont connectors (male to female) to connect the MiniAmp to the Pi 2W.  I've read that GPIO 18, 19, 20 and 21, using pins 12,35, 38 and 40 respectively are used.  This is from HiFiBerry documentation found online.

Which other pins, in addition to the GPIOs will I need for Power, Ground and anything else not mentioned in that post?  Since it warns of only using a few milliapms of the 3V source, I've assumed it wants 3V from PIN 1 and would want a ground on either pin 6, 9, 25, 30, 34 or  39.  

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