Thank you for your question. We recommend following the tutorial below to learn how to install a plugin. It shows how to enable the plugin on your Joomla site.
How to install a Joomla 2.5 Plugin
You will need to position the plugin on the front page you can make a module for it and add it to your Front Page. Please see the following link on how to do add articles to your front page and on how to sett up a module.
105: Featured Articles and your Joomla 2.5 homepage
How to install a Joomla 2.5 Module
How to View Module Positions in a Joomla 2.5 Template
Hope this helps,
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