I'm sorry, but I'm still not sure I understand what you mean by "connected another row of resistors to ground." Perhaps if you could PM me, maybe with a picture, I could help you further.
The code on the first page is really just a framework for making it do whatever you want it to. It contains a bunch of subroutines which you can fill to have it perform certain actions when certain events occur. I think the subroutines are fairly self-explanatory (i.e. on_press, while_pressed) Right now it does the following:
On startup, all the buttons are set to be blank.
When you press a button down it lights it up green and sends the coordinates of the pressed button (row, column) to the serial port. When the button is released it makes it blank again.
As I said, it's just a framework.