follow steps….
1. Cpanel in create user
2. Create datebase
3. Add full permissions this database and add user permission
4. After add wp-config.php file in this info
/* MySQL settings */
define( 'DB_NAME', 'database_name_here' );
define( 'DB_USER', 'username_here' );
define( 'DB_PASSWORD', 'password_here' );
define( 'DB_HOST', 'localhost' );
define( 'DB_CHARSET', 'utf8' );
/* MySQL database table prefix. */
$table_prefix = 'wp_';