You set the jumpers under the polulu modules, most boards this is jumpers, some boards this is software... depends on what board you have.
Eg for ramps see the colored jumpers below
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Set as desired following this table
![motordriver-pololu-a.jpg]( "motordriver-pololu-a.jpg")
High == jumper on.
Eg for ramps see the colored jumpers below
Set as desired following this table
High == jumper on.