The Updated instructions from the nice folks at North Lakes Woodwork is the most complete instructions we have found for these NEJE systems.
It does work, or we would have many members reporting an issue. To get you started, you will want to run in ‘Absolute Coords’ and read about why here: Coordinates and Job Origin - LightBurn Software Documentation
If you share the “warnings” you are getting, we can review.
We will need much more detail to help you with this statement.
Where do you have the Machine Origin set? Should be lower-left.
I would suggest you have a read through our new documentation as it can provide much of what you are after. LightBurn Software Documentation