QTR-Quadtone RIP

I am trying to make custom linearized curves for K6 on the 7000.

I printed and measured the grey scale correctly for a couple of rag
papers. I was able to make the linearization graph correctly. From
this documentation, at this point in the process, I am not able to
figure out how to create the actual curve for use.

When I drag this graph of linearized data into the Drop Graph icon it
tells me -  "Curve Design" cann't be modified.

When I try to drag this graph into the Drop Quad Profile icon it tells
me - Printer Not Defined.

Anyone been through this process? Where does the graph go? What am I
doing wrong?

John