When you add a new domain to the dashboard. One the build process has completed (if your using WordPress) and the status is Waiting DNS update. To the far right of the main dashboard view. Next to the domain you have just added. You will see the Nameservers that you need to update that domain too.

We do not use just one set of nameservers like traditional hosting would do. Instead to avoid footprints, you will be returned many different combinations of nameservers depending on what CDN and DNS services you have selected.