There are different ways to create a drop-down menu for your Joomla 2.5 web site.
For example, if you are familiar with the CSS code, you can try to directly edit the corresponding .css files of your default Joomla 2.5 template. More details on how to change your default template can be found in the following article:
http://hostlantern.com/clients/knowledgebase.php
Or you can use one of the offered Joomla 2.5 extensions:
http://extensions.joomla.org/extensions/structure-a-navigation/menu-systems/drop-a-tab-menus
A good solution is the swMenu component and the corresponding module. They can be installed from your Joomla 2.5 admin area -> Extensions -> Extension Manager. Detailed instructions on how to install Joomla 2.5 extensions are published at:
https://www.siteground.com/kb/How_to_install_a_Joomla_25_extension/
Once the installation is completed you can manage the menu component and the integrated module through the Joomla 2.5 admin area -> Components -> swmenufree.
Play with the options and find the ones that best suit to your web site style.
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