Multiple LCDs unique message display

upboard_test

I have UP2 Board and Grove Pi attached to it. I am trying to display different messages on 2 LCDs attached to the grove.
I followed through "Hello World" program and it is displaying Hello World on both LCDs.
Aim is to display unique messages on both LCDs, but any change on code gets applied to both LCDs. For example, how would I print "hello world" on 1 LCD and "Goodbye World" on another rather than showing same message on both LCDs ?
LCD used is one used from Intel UP2 Grove Development Kit

Is there any way to uniquely identify both of LCDs attached to grove? I have attached piece of code and line highlighted initializes the LCD, How would we differentiate 2 LCDs attached to grove?