How to get HTTPS on your own domain name
The get an SSL certificate with your domain name you must transfer it to where you host it, in this case with us at YorName.com.
YorName offers domain names and domain name transfers at a very reasonable price. And you get a free SSL certificate.
Go to the preferences of your site, the icon at the top right of the editor and choose "Site Address - Domain Name" ... Then, "Transfer an existing domain name to YorName.com".