Comodo secure DNS

I copied the following from somewhere(?). “I’m using Comodo’s Secure DNS since Im using Comodo firewall.”
Is the quote correct or do I have to do more to use Comodo Secure DNS?

The installer of CIS gives you the option to use SecureDNS or not. It is enabled by default, so unless you unticked the box during installation, you should be using SecureDNS.

You can follow the instructions on this page: Switch Now - Change to Comodo Secure DNS Service

To see if you have the SecureDNS servers enabled. If not, you can use those instructions to start using them.