As I posted in the previous page you linked to:
self.contents.draw_text(x, y, width, height, text, align)
x- coordinate
y- coordinate
w - width size
h - eight size
text - your message
align - 0 (right) 1 (center) 2 (left)
You will need to add this code where ever you plan on adding text in your game. What exactly are you trying to edit?