The hosting asks for an ip

Cloudflare asks to change
ns21.piensasolutions.com
ns22.piensasolutions.com
By
dora.ns.cloudflare.com
garret.ns.cloudflare.com

But when trying to configure it, two fields appear to me.

If I change only the names and leave the IPs as they are …
Will it be configured correctly with cloudflare?
Do I have to change these IPs for a cloudflare IP?

Thanks greetings

Dnschecker.org can show you the A record IP addresses for those hosts.

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