Edit the 404 page content with Genesis

functions.php

<?php
// Paste the code BELOW this line into your child theme functions.

/**
 * Edit the 404 page content
 * 
 * @author Reasons to Use Genesis
 * @link http://reasonstousegenesis.com/genesis-404-entry-content/
 */
add_filter( 'genesis_404_entry_content', 'rtug_404_entry_content' );
function rtug_404_entry_content() {

	return 'Looks like you found a broken link. You can <a href="/contact/">let me know about it</a>, or try to find it yourself with the search form below.';

}