This is fine, but that does mean you have to add the DNS records that the SSL creation tool wants manually.
However, since you’re using Cloudflare you might not even have to install an SSL certificate on your site directly. When I go to your site it’s already using HTTPS, probably because you have the default of Cloudflare’s flexible SSL enabled. But if that doesn’t work for you for whatever reason, you can switch to using Cloudflare’s SSL mode to full. All custom domains on InfinityFree automatically have a self-signed SSL certificate installed now, so all you have to do is change the SSL mode in Cloudflare’s settings.
