Alright, you've created your first redirect, but then these DNS changes appear.
DNS changes are necessary for letting the internet know where the servers are for any given record on the domain. For using redirect.pizza, we want to let the internet know that example.com can be found at location 188.8.131.52. We do this by making DNS changes on the domain in question.
These DNS changes need to be made at your domain provider. In most cases, this can be done with your domain registrar. Examples of these are GoDaddy, Hover etc. If you use external nameservers (Cloudflare for instance), you need to make the changes there.
Unsure where your DNS is hosted? A good way to check this is to see where your nameservers point. You can check this with an online tool like WhatsMyDNS: https://www.whatsmydns.net/#NS/example.com
When you've set-up the redirect in your account, the required DNS changes are visible under the 'Hostnames' tab.
Both CNAME and A types are valid options. We recommend using CNAME for everything, except for non-www (apex) records. A big plus of using the CNAME is automatic IPV6 support and that it's always up-to-date if there ever is an IP change. View more info about the available DNS record types here.
Made the necessary DNS changes? It may take up to 24 hours before these changes are fully propagated! Please be patient.