Certificates Wall can be added as widget in your Joomla site with few clicks. Download the module for your version of Joomla.
|Joomla 1.5||Joomla 1.6/1.7|
You standard Joomla installer to install the module.
After installation you must to configure the module. You will have to enter your ID. To get your ID, login to the site and go to "Share the Wall" section and then open "Joomla" tab.