You need to create a MySQL user before that user is able to use the database. This does not automatically allow the user to use a database - you need to grant that user permission to the specific database first. Refer to Grant a user's permissions to a MySQL database for more information.
1 To access the MySQL Account Maintenance Menu, click on the icon above the words MySQL Databases on the main screen of your cPanel interface.
2 Enter the name of the new user in the blank field next to UserName:
3 Enter the password for the new user in the blank field next to Password:
4 Click on Add User to create the new user.