Domain Issue

I converted from another CMS to Dolphin 7.3 

I test phase we used the domain http://secret.mydomain.com

Turned the site live Yesterday we use  https://www.mydomain.com or https://mydomain.com

I changed the header.inc.php  line 3 to 

$site['url']               = 'https://' . $_SERVER['HTTP_HOST'] . '/';

The problem is the site administrator now says Trial License.

first - change the site url to https://mydomain.com

secret.mydomain.com is what I am guessing you have your license registered to - not https://' . $_SERVER['HTTP_HOST'] . '/';

change the site that your license is registered to.