DNS zones are created when customers are initially provisioned with DNS services. Additional zones are created when domains are added to the DNS service. Customers with DNS Service Administrator permissions can create DNS subzones to which they can also add DNS records.
When you create a DNS record, only the Time to Live (TTL) setting can be modified. To change other record settings, you must first deprovision the record. When you have finished making changes, you provision the record again.