In order for your MySQL database to work as intended, it will need a script calling or querying the database for the information it stores. In order to do this, you must connect your script to the database with a configuration file.
If you are not sure where your configuration file is, check this list of different scripts to find its location:
Configuration Settings
Database driven scripts, such as Wordpress, WHMCS and Joomla, will generally have a default configuration file ready for you to edit with the appropriate information. Below you will find examples of what this access information will look like:
Host Name = localhost (literally input localhost)
Database Name = cpanelUsername_databaseName
Database Username = cpanelUsername_databaseUsername
Database Password = whatever you selected
WordPress Example
######################################################################
| Username = joe1337 | Database Name = wrdp1 |
| Database-Username = wp1 | Database-User Password = eHTb7%Pxa9 |
/** The name of the database for WordPress */
define('DB_NAME', 'joe1337_wrdp1');
/** MySQL database username */
define('DB_USER', 'joe1337_wp1');
/** MySQL database password */
define('DB_PASSWORD', 'eHTb7%Pxa9');
/** MySQL hostname */
define('DB_HOST', 'localhost');