[SM-USERS] change_sqlpass-3.3-1.2 errors

[Techy]

Afternoon all, looking to allow for changing passwords, using a qmail/vpop scenario on a CentOS4.2 box.  User data is being stored in mysql so I downloaded the change_sqlpass plugin.  Did the norm, downloaded, untar, configured the only line I saw relevant;
$csp_dsn = 'mysql://user:[EMAIL PROTECTED]/email_users';   (using the correct login authentication) but not sure on the rest.

Looking at http://pear.php.net/manual/en/package.database.db.intro-dsn.php really gave no insight, the table structure is :
db name: vpopmail
table: vpopmail

in there are the pw_name, pw_domain, etc.

Any help is appreciated.

Lance