It's not that hard. In Config/Ports and Pins/Motor Outputs check the "enable" box for A. In General Logic Configuration, check the "A=Axis is angular" box, if it isn't checked already. In Toolpath Configuration, make sure that X-Axis is checked if your A axis is set up parallel to X (if not, uncheck X and check Y or Z)."A-rotations Enabled" and "Use radius for feedrate" boxes should each have a check too. And in the Settings box (alt-6) you should set a diameter for A in Rotation Radius that's greater than zero (like ,001"). Then test A and see if it works.