Need help with main.inc.php db.inc.php

[inf4mi]

Need help with main.inc.php db.inc.php

I can`t understand how exactly to set up all settings in these files !!!

Can U show example


Thank You !!

[inf4mi]

I read everything here!
I have site - mysite.org
I have subdomain -  mail.mysite.org

It doesn`t work

Can U show example???
DB - MySQL

[inf4mi]

I set up problem.
But There is no button "Registration" for users.!