Update your nameservers
To use Cloudflare DNS as an authoritative DNS provider - be it in a primary (full) or secondary setup -, your domain nameservers must point to nameservers that you get from your Cloudflare account. Updating your nameservers is required to activate your domain on Cloudflare and use most of our application services.
Specific processes
Although Cloudflare will provide you the nameservers or allow you to create your own custom nameservers, the final step to make Cloudflare an authoritative DNS provider for your domain may have to be done outside of Cloudflare.
Unless you are using Cloudflare Registrar, consider which of the following sections correspond to your use case.
Your domain uses a different registrar
If you have acquired your domain from a registrar other than Cloudflare Registrar - and it has not been delegated to another zone - you need to update your nameservers at your registrar. This is not an exhaustive list of provider-specific instructions, but the following links may be helpful:Provider-specific instructions
If you do not know who your registrar is, you can use a Whois search, such as ICANN Lookup. If the registrar indicated on your Whois search result is not a service that you have interacted directly with, you may have acquired your domain from a reseller.
You have acquired your domain from a reseller
Some services, such as website builders ( Squarespace, for example), are not registrars but act as a reseller, allowing you to buy domains directly from them.
In that case, you may have to update your nameservers in the reseller platform, not at the registrar.
Your domain is delegated to another zone
If you are onboarding a subdomain shop.example.com as a child domain, it is expected that the child domain has been delegated to the parent domain.
Delegation means that shop.example.com has specific NS records set up for it within the DNS records management of the parent zone (example.com).
If that is the case, when setting up your zone in Cloudflare or opting for a different set of nameservers, you have to update the NS records in the parent domain, and not at the registrar.