To access phpMyAdmin, sign into the control panel and then click on the "Extra Features" icon, followed by the "phpMyAdmin" link.
phpMyAdmin is a tool written in PHP that allows you to administrate your MySQL databases. You can execute SQL statements, work with fields (add, edit, delete), work with tables (create, alter, drop), create additional databases, and much more. phpMyAdmin is intended for advanced users.
You can find more info how to use php my admin here.