Go to the DNS Settings of your domain’s host
Click Domains and SSL
Select the Domain
Select the gear icon
Select DNS
Select Add Record
Select TXT
On the Host Name, type _dmarc
Now for the value, copy or type this text 
(v=DMARC1; p=none; sp=none; rua=mailto:dmarc-reports@domain.com; ruf=mailto:dmarc-reports@domain.com; rf=afrf;pct=100; ri=86400)
Be sure to replace the domain name with the one you are configuring
Copy and paste the text file on the value
Click Save
You have now successfully added a dmarc record on your account.