Navigate to the zone for the parent domain (example.com).
Select + Record set at the top of the overview page.
On the Add record set page, type the following values in the Name text box:
For Dynamic DMARC enter: _dmarc
For Dynamic DKIM enter: _domainkey
For Type, select NS.
Under Name server, enter the following values:
For Dynamic DMARC enter: ns-dmarc.ondmarc.com
For Dynamic DKIM enter: ns-dkim.ondmarc.com
Select OK to save the new record.
Create a free OnDMARC account to test your configuration.