In Site -> General -> Miscellaneous, you could further configure some settings. Click "Save" button after you have done the change.
Here is the description about these settings.
1) "Use Dedicated SSL Certificate"
Check this box if you have a SSL certificate installed. All the pages that need secure transmission to server will be using SSL. These pages are login page, register page and checkout page etc.
Note: please make sure SSL is installed on IIS and also Https is enabled on your firewall.