Looks like wrong info in the config-file compared to the database user settings.

Have you created a db user/pasword and db with your hosting service?

Thats the info you need to add to the config-file. localhost is fine if you have a cPanel service, if not, probably yo also need some other DB host address for the config file.

Open the config.php in a text editor and replace/save the info.


// Enter MySQL infos
$mysqlHost = 'database:address';
$mysqlUsername = 'database_user';
$mysqlPassword = 'database_password';
$mysqlDatabase = 'database_name';