Panelou & Sanguino setup ?

I'm trying to connect a new Panelou2 LCD to my Sanguino board 1284p (with onboard MARLIN )

So how do I get the Sanguino to recognize Panelou LCD board ??

I read that I need to use Arduino .23 to load firmware.... but my Sanguino already has Marlin.....s o I have now altered the Marlin configuration.h file by uncommenting #Panelou2 & then uploaded the file via Arduino.

I think there is another step I must take to actually have the Saguino board recognise the Panelou2 LCD board... yes ?

note: I can move the Prusa i3's motors using Repetier ( in manual mode )

I still need to calibrate the Prusa i3 printer.