DNS/Cloudflare/supportについて、ここに記述してください。

https://support.cloudflare.com/hc/ja/articles/360021801151-Cloudflare-DNS%E3%82%92%E4%BD%BF%E3%81%84%E5%A7%8B%E3%82%81%E3%82%8B

https://support.cloudflare.com/hc/en-us/articles/360021801151-Getting-Started-with-Cloudflare-DNS

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https://support.cloudflare.com/hc/ja/articles/360019093151

Managing DNS records in Cloudflare 
https://support.cloudflare.com/hc/en-us/articles/360019093151