CNAME Records gets auto deleted, HELP ME

I am creating a subdomain of my website through CNAME.
subdomain is and it points to, but every time when i add these records in Cloudflare’s CNAME, if gets auto deleted after some time. I don’t understand why is this happening. is hosted in google blogger and will be hosted on server.
Please help me to resolve this issue ASAP.

Is your domain already using the Cloudflare DNS nameservers, or are you in the process of moving your DNS settings?