How do I add the Certify Code to my Joomla site?

The code needs to be added to your site’s index.php and component.php files. To add the code to the index.php file, open the file, scroll all the way to the bottom, and insert the Certify Code right above the closing tag.

Here is some information on combining php and HTML: http://php.about.com/od/learnphp/qt/php_with_html.htm