We're seeing reports from some blog owners, who purchased custom domains through Blogger / Google, who are unable to access the registrars zone editor through Google Apps. Owners of blogs published to custom domains, where the domains were purchased through "Buy a domain", need to use the registrars zone editor to maintain their domains. In the past, the zone editor could be accessed from a link in the "Advanced DNS settings" wizard in the "Admin console" / Google Apps dashboard. The "Advanced DNS settings" wizard provides important tokens, to let the owner of a domain, purchased through Blogger / Google, interact with the registrar. Besides the tokens, there is a link, captioned "Sign in to DNS console", which should lead directly to the sign in screen provided by either eNom or GoDaddy.
What Blogger won't tell you