SSL does not work on a free domain

Website URL

http://lemontana.kesug.com/
(please specify the URL of the site on which you are experiencing the problem)

Error Message

SSL does not work on a free domain
(please share the FULL error message you see, if applicable)

Other Information

Hello, I created an account with a free domain (kesug.com). I uploaded my HTML site. But when I open it in the browser, it indicates that the connection is not secure, and there is no HTTPS protocol. How can I connect a free SSL to this site?
(other information and details relevant to your question)

You need an SSL certificate

Hi, and welcome to the community.
Your site supports HTTPS, but you’ll need to access it using the https:// protocol instead of http://. To force HTTPS for all traffic, please read this: