Updating Mod for 150 - Little Problem

[ScriptJunkie]

Ok, I found a tutorial at w3schools.com on how to write a PHP define.

The sample they provided looks simple enough:

<?php
define("GREETING","Hello you! How are you today?");
echo constant("GREETING");
?>

But here are my questions:

1. Where do I put the define?
2. How do I determine what the define's value should be?

I think that in order to understand what the define's value should be, I need to understand the logic behind the output (i.e. where will it appear so I can figure out what its supposed to say? what purpose is it serving?)