We support adding external domains in your account via API method (can be found in profile circle > Settings > API)
OR, you can go to "domains" page and on bottom select "connect existing domains" and follow the process show !
Once we setup the domain, we will provide with 2 nameservers per domain that needs to be added on your domain registrar by you. This step in inevitable.
Nameserver rule: set only our 2 nameservers at your registrar — nothing else. Extra or leftover nameservers (or none at all) will prevent us from generating DNS and the domain will not work. We manage all DNS records ourselves; you do not (and cannot) add MX/SPF/DKIM/DMARC or CNAME records by hand.
Cloudflare Registrar: domains registered through Cloudflare Registrar cannot have their nameservers changed away from Cloudflare, so they cannot be connected unless you transfer them to a registrar that allows nameserver changes. (A domain that merely uses Cloudflare DNS but is registered elsewhere is fine.)
Best,
maildoso Team