Hi George, hopefully this will help.
- Open up a terminal.
xinput listthis will give you the name of your device. In my case, it is
Evoluent VerticalMouse 4
- To change the order of the buttons, run
xinput set-button-map "Evoluent VerticalMouse 4" 0 3 0 4 5 6 7 0 2 1 2
- I don't know what order you want your buttons in - so I suggest you read the blog post carefully to see which buttons are which.
Hope that help. Leave another comment if you want more info.