Out of the box your paper is read at your-desk.newsroomfloor.com. To read it at your own address you type the address into your desk, add one record at your registrar, and it serves; the certificate is ours to handle. Your built-in address keeps working either way, so no link ever breaks.
Open Your own domain on the Admin tab and type the address under Your own address. The page decides which of the two lanes DNS allows, asks the edge for the address, and prints the one record with its real values. It then re-reads the domain each time it renders, and the floor re-reads every pending domain every five minutes on its own, so it goes live whether or not you come back.
For news.example.org when example.org stays wherever it is today.
For example.org itself, with nothing in front of it. We do not take this yet, and the reason matters: a whole domain cannot be pointed with one record at most providers, and the way we used to do it was to ask you to move the domain's DNS to us. Your DNS is also where your email lives. We stopped offering it rather than hold something where our mistake would cost you your mail instead of your paper.
Use a subdomain in the meantime. Serving a whole domain from your own DNS, with one record you add and keep, is being built.
When a paper is read at more than one address, the primary address is the one search engines treat as the original. It is not set by default, so each address is its own canonical. Once your domain serves, set it under Desk settings, General, Primary domain, so the paper does not split its ranking between two addresses.
Questions go to support@drm3.io.