Dyn Standard DNS provides two separate interfaces for managing DNS records: the Standard interface, which provides support for basic record types such as A, CNAME, MX, and TXT records, and the Expert interface, which includes support for additional record types such as PTR, NS, SRV, and more.
You can switch between the Standard and Expert interfaces at any time using the Preferences button in the upper right of the page when viewing a Dyn Standard DNS zone. This setting is stored on a per zone basis, so some zones can be in the Standard interface and others can be in the Expert interface. No data is lost when switching between interfaces, but you cannot add, modify, or delete records other than A, CNAME, MX and TXT in the Standard interface.
Deleting records in the Standard Interface