Nema 23 Current setup

How do you setup the Nema 23 current for the arduino. The instructions lead to another page that advises to do this: Start by setting current to zero by turning the trimpot all the way
counter-clockwise. Then issue a very long Gcode command for that axis,
something like g0x1000.

Does anyone know where to put Gcode commands?

Also whats a good current limit for X Y & Z motors?

This is great! thanks

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