phpMyAdmin lets you manage MySQL databases. You can change database values, run queries, and create, view and modify your database structure.
Before modifying it, you should always back up your database.
Programs like WordPress® and Joomla® provide their own interface for modifying most aspects of a database. If you are using one of these programs, you probably don't need to use phpMyAdmin to manage the database unless specifically instructed to.
For more information about working with phpMyAdmin once you're logged in, visit phpmyadmin.net.