CLOUDFLARE error

Hello everyone

I encounter a problem when I want to activate my cloudflare to my free domain (.rf.gd) since the Cpanel I get this error:
CLOUDFLARE ERROR: We were unable to identify mydomaine.rf.gd as a registered domain. Please ensure you are providing the root domain and not any subdomains (e.g., example.com, not subdomain.example.com)
How I can fix this error

thank you

You cant use the rf.gd domain. You have to get a domain in order to use the cloud flare system

Ah OK thank you. But then, how do I get a free SSL certificate for this type of domain?