cloudflare cant be activated

CLOUDFLARE ERROR : We were unable to identify as a registered domain. Please ensure you are providing the root domain and not any subdomains (e.g.,, not
please fix this !!!!
theres 000webhost who provides those servecis for free so !

Using cloudflare on subdomains that provided by hosting is impossible.

Cloudflare only allows custom domain names, to be used on their service. As much as we would like to be able to create Cloudflare accounts for our subdomains, Cloudflare doesn’t allow such domain names to be used.

i didnt use any ressoreces and got suspended