Cant find exact words on that website, but from the looks of it that board seems unipolar and those motors have 6 wires so can be wired in unipolar configuration. But the motor from extruder is certainly bipolar coz it has only 4 wires. To connect it as unipolar you would need 2 more wires which are middle taps of coils, and that motor doesnt have them. So either use a bipolar driver with that bipolar-only motor, or try replace motor with another nema 17 with 6 wires which can be hooked unipolar. Reprap uses only bipolar drivers, thats why extruder came like that, so its not seller's fault or something.
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