I am trying to update the nameserves from duckdns but I don't find where?

[skylarstoffels.origi]

What is the name of the domain?

homeserversky.duckdns.org

What is the issue you’re encountering

I don’t find where to change the nameserver

What steps have you taken to resolve the issue?

I looked everywhere for it, but still can’t find it.

What feature, service or problem is this related to?

Nameservers

[Laudian]

I don’t believe you can use a duckdns subdomain with Cloudflare.

[skylarstoffels.origi]

What do recommend I do now?

[Laudian]

You would need to buy a domain to use Cloudflare.

[skylarstoffels.origi]

Do you know somewhere I can do that for free?

If not, what do you think is the most reliable?

And thank you for helping me.

[Laudian]

I’m not aware of any free domains that you can use with Cloudflare.

You can buy a domain directly at Cloudflare or with almost any other registrar. I can’t give you recommendations as to which you should use.