Delete Nameserver from Cloudflare

How can we delete Nameserver from Cloudflare?

I’m trying to point this site (rugbyschool.ac.th) 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 (www.rugbyschool.ac.th) that is on the Cloudflare Cloudflare network. Cloudflare is currently unable to resolve your requested domain (www.rugbyschool.ac.th).

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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