I set up a domain and got the A + score in the SSL Labs tests. Now I have in the test the item "DNS CAA NO". This refers to the company that issued the certificate. I have consulted the Geotrust documentation that is the issuer of the certificate. In the documentation indicate the parameters:
• CAA 0 issue “geotrust.com”
I use ubuntu 16.04 / nginx. Where do I apply this setting?