Getting y2

If I leave extruder enable to 1. Would that keep the y2 driver from being enabled. I have an octopus, and I am trying to get the second y working. The reason I don’t use the skr pro is that the driver doesn’t work on one direction on z. When I try to change direction z won’t run. So I’m using an octopus I had. If someone can help me I would appreciate it. Where should the y2 plug plug into the mo4 socket octopus. All the other, motors work. But I left the number of extruders to 1.