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I am also having the same trouble understanding the function of the secondary admin password. I have upgraded to v7 with no trouble, but am now trying to change the default theme under Main Settings in the admin panel. There is no where on the page where I can input the secondary admin password. When I change the default theme and click the Save Settings button, I receive the following error message: "403 Forbidden - You don't have permission to access /administration/settings_main.php on this server."

I've checked the folder chmod settings for this folder and it is set to 777. I don't know what else to do. Can someone help clarify the use of the secondary admin password so I can update the Main Settings options in the Control Panel?

Thank you!