I have not see Multi Domains dashboard

Dear Sir,
After installing multi-domains and domain mapping plugins, in my netword dashboard, settings, I have not find multi domains, can no add many domains. Is my set multi domains or domain mapping plugins have error?
May I have not rename dm-sunrise.php
I try to ftp dm-sunrise.php to that file then delete sunrise.php but have error.
What I should do now.

Thank you so much!
Fred
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Domain mapping Options I see -------If you are having problems with domain mapping you should try removing the following lines from your wp-config.php file:.

define( 'DOMAIN_CURRENT_SITE', 'yourdomain.com' );
define( 'PATH_CURRENT_SITE', '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );
Note: If your domain mapping plugin is WORKING correctly, then please LEAVE these lines in place.