In this tutorial we'll show you, how to install a Joomla! 2.5 module to your website. We'd recommend you to check out our Joomla tutorials section.
Log in to the Administrator section of Joomla website. Type at your browser address bar www.your-site.com/administrator.
At the "Upload Package File" section, click to browse button, select the module which you want to install and then click Upload & Install.
From the main joomla menu click to Extensions -> Module manager. Use the Search or Filter feature to find module, and then click on the module. Change module status from unpublished to published and assign module to pages on which you want to see just installed module.