Database Password

How can I know the password to the database that I created using WP-DBManager? I could find ‘Database Host’, ‘Database Name’ and ‘Database User’, how do I know the password?

I need the password to connect to the database from a PHP script.

mysqli_connect(“host”,”username”,”password”, “databaseName”);

http://ww.wp.xz.cn/plugins/wp-dbmanager/