Add the Domain URL

Click the "Domain" sidebar item, type the URL and save it.

If the domain is valid, it will return the following DNS records:

Add the DNS Records

In my case, I'm using cloudflare, but every DNS provider should have an easy way to add/edit/delete your DNS records:

Back to the Domain tab, click Check again to see if the records have already propagaded.

The DNS records could take up to 48 hrs to propagate.

You should now be able to use the domain. In my case it's dircraft.