Thanks for writing in and I would be happy to help here.
At this time, editing DNS records on your end is not possible. However, we can make these changes with the exception of editing Nameservers. The functionality for user to edit their own DNS settings and more is on it’s way.
If you were to point your domain to an externally hosted website (by having us edit the DNS records), you would need to create a coming soon page on your Mailchimp Website at a minimum, in order to keep the promotional value of the domain past one year.
Were there any specific reasons you were looking to edit he DNS records?