I can't add blogger cname record

I tried adding blogger cname record in cloudfare dns but I always get an error code.

Cname - www
ghs.google.com

Hello,
Can you please clarify which error you’re getting?
Are you adding this record as “proxied” (orange-cloud) or “dns only” (grey-cloud)?

See
https://support.cloudflare.com/hc/en-us/articles/360019093151-Managing-DNS-records-in-Cloudflare
And
https://support.cloudflare.com/hc/en-us/articles/200169626-Identifying-subdomains-compatible-with-Cloudflare-s-proxy