Flow path control manual edit in autogrid
 

Can anyone help me on "manual edit" of "flow path control" in autogrid.
I click "manual edit" then chose the control line I want to change expansion ratio. The pop-up window has options like " at the start" and so on. It also has "clustering info tool".

How can I use this tool to change the expansion ratio?
I use this tool calculate the points needed for certain expansion ratio and spacing.
But I don't know what to do after this?