That particular link is not the same thing that cellarius posted. That's a plugin that would only execute when a particular style is used. Not the other way around.
In your Admin CP in Plugins & Products, you'll see the Add New Plugin option. You put the code there in a new plugin, and select the hook cellarius mentioned. You should remember what THIS_SCRIPT is, as it's what you changed one of the test lines to when you created your custom page.
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