Select Add Record, choosing TXT record as the type.
Here you will add the TXT record:
Name: _dmarc [it may automatically append to _dmarc.domain.com.]
TTL: 60 (so that you do not need to wait too long before verifying)
Type: TXT
Record: v=DMARC1; p=none; rua=mailto:rua-import-xxxx@sendforensics.com [Notes: replace rua-import-xxxx@sendforensics.com with your own unique SendForensics RUA processing address which can be found in Domain Settings for your domain.]
Select Save Record to save your new TXT record.
Wait for at least 60 seconds, then you can verify that you have the correct record entered in Domain Settings for your domain.