Choose the device(s) you want to be protected. Locate the Network Settings page where the DNS servers are configured (also known as Nameservers). It is generally under Network, Connection, WAN or Wifi settings.
In case you need more details, we have step-by-step guides for the following devices (we include Apps for some of them to simplify your life): Mac, Linux, iPhone, iPad, Windows, Android. We also have Guides for a number of different configurations, routers and devices.
That's actually it. If you want to get your whole house protected, you can configure your home router to use the same DNS server provided on step #2.
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