CloudFlare problems...

When I try to activate CloudFlare, I receive this error: “CLOUDFLARE ERROR : We were unable to identify (my website).epizy.com as a registered domain. Please ensure you are providing the root domain and not any subdomains (e.g., example.com, not subdomain.example.com)”. I don’t even have a subdomain.

I have free domain from InfinityFree.net

The Cloudflare message is correct, you are trying to use a subdomain. The free “domains” we provide with accounts are actually subdomains of domains we own. And Cloudflare does not recognize our subdomains as valid domain names, which is why you cannot use them with Cloudflare.