This domain is currently not using Cloudflare nameservers, so no setting in your Cloudflare account can act on the domain.
Nameservers:
NS11.WORLDNIC.COM
NS12.WORLDNIC.COM
You first need to change the namservers to the pair you see in your Cloudflare DNS page… then we can work on any issues that arrise from there.
As for the 521 error, you can find some troubleshooting steps here:
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