Delete Nameserver from Cloudflare

How can we delete Nameserver from Cloudflare?

I’m trying to point this site ( to Clouldflare but it say there is CNAME on Cloudflare already. When try to point IP to Cloudlfare the site goes down and show " Error 1016: Origin DNS error" - Troubleshooting Cloudflare 1XXX errors – Cloudflare Help Center

Here is the error message;

> You’ve requested a page on a website ( that is on the Cloudflare Cloudflare network. Cloudflare is currently unable to resolve your requested domain (

Any idea how can we find old account and delete it from Cloudflare as we’ll be creating a new account?

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