Setting up rotary chuck on creality falcon 10W

I’m trying to setup my creality pro rotary chuck with a creality falcon 10W.

In the laser settings, I can’t set the rotary axis to Y axis as it sin’t an option. It just says “ axis configured in custom Gcode”.

How do I do that?

I have a creality Falcon 10W laser engraver.

In lightburn I’m on version 2.0.04

I’ve attached a creality pro rotary chuck.

I’ve attached it to the Y axis white plug.

In lightburn, I’ve gone into laser tools / rotary setup, chosen chuck, set the sizes, but I can’t choose the Y axis. It says “axis configured in custom Gcode” where all the video tutorials I’ve seen say choose Y axis.

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What does this mean and how do I do it?

When I do the test run, the x axis seems to work ok, but the Y axis spins 4 1/2 full revolutions. When I tried engraving a square, I got a very long rectangle around the cylinder.

Any help with any tutorials would be appreciated.

When I change the mm per rotation and ‘frame’ the 30mm x 30mm square that I’ve drawn, it has no effect on the elongated rectangle that the laser draws around the cylinder.