LCD unit on ramps... how does it work ? (no replies)

I got my new Arduino / Ramps together with an LCD unit with card slot.

I wander, what should I see on that LCD and what must I do ?

Will it show anything while just uploading firmware ? Because that is my current phase..... It is not on the printer yet.
Plugging it on the ramps does not power the LCD unit ....or at least, I see nothing happening.

Thomas