I have a stepper motor (STP-MTR-23079 from automation direct) and I bought the stepper motor extension cables as well. How do I connect this stepper motor electrically? The extension cable jacket has 4 wires (green,red,black,white) coming out from it. So which ones to connect where or how to connect them to the stepper motor?

In Chapter 4 on this page:

SureStep™ Stepping Systems User Manual - AutomationDirect

There is the relationship of colors to A ~A, B and ~B.

Thanks "KeepItSimpleStupid" for the link! It did help...