If you are seeing this message, something is not right.
Once the name servers are set (I can see they are) everything is done in Netlify. You should then assign joelstransky.bio as a custom domain and Netlify will automatically create NETLIFY type records for the domain which you should then see on the Domain management page.
You don’t add A, AAAA, or CNAME records for Netlify, only for subdomains hosted elsewhere (e.g. mail).