Dns not working on newly published site

I recently published a site on readymag to which I had connected a .com domain that I previously used on squarespace. I disconnected and transferred the domain from my squarespace site to readymag and followed all the the SSL and domain mapping instructions. In edit mode, under the Domain tab, I’m seeing the message that the SSL is connected and DNS may take up to 72 hours to connect. Above that it says my domain is mapped. I completed all the steps a few weeks ago, but whenever I try to open my site, I get the message DNS_PROBE_FINISHED_NXDOMAIN. What does this mean, and how to do I fix it?

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