Well, you have it plugged in and operational, so I guess that must mean you didn't blow up the drive by plugging it in 'hot'
Here is what I do: ESTOP, go to settings and select the proper indexer from the list, and also input the OD of the part if I think of it at this time.
Then, still in ESTOP, plug the indexer cable in. Remove the ESTOP and clear the alarms. Then go to Zero Return mode, hit A and then zero single axis. This will home the indexer. You might see an alarm sometimes during this initial homing. Just clear it and try again.
After that, make sure that you use G00 mode with your commands
G00 A180.
G00 A0.
If you command in G01 mode, it may not move if no feed was in effect or if the diameter of the part was input as zero.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)