How do I configure my domain to use Cloudflare's DNS servers with IPv6?

First, create a Cloudflare account and add your domain. Cloudflare will scan your existing DNS records. Then, update your domain's nameservers at your registrar to point to the nameservers Cloudflare provides. Cloudflare automatically supports IPv6; ensure your origin server has an IPv6 address and create an 'A' record pointing to it in your Cloudflare DNS settings.