1.You replace the Y axis with the rotary and depending on the gearing and motors used on the rotary accessory ( usually in the documentation that comes with it ) you may have to adjust the $101 value for the motor resolution in the firmware, its usually from 80.0 to 100.0 or vice versa.
2.Unlike LightBurn that has a built-in calculator that adjusts steps per mm for rotary adapters (and does it somewhat transparently), in LaserGRBL you need to do the calculations yourself. Design a simple square that will cover the area you want to engrave, do a test engraving, and then calculate the new steps per mm for the axis that you are using (usually Y, but can be different depending on what you are engraving on.
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Okay, thanks!