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grep is your friend.
<?php if (!defined('APPLICATION')) exit(); ?><div style="margin:15px"><h1>We are sorry but we could not find the page you are requesting.</h1><h5>Please Try one of the pages below:</h5></div>
$Sender->Head->Title('Page Not Found');
Pardon the noob-ness @x00:
Where do I make this edit?
In your custom pages php file /plugins/CustomPages/pages/YourFile.php.
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Check out the Wiki for lots of information about common stumbling blocks.