There are several reasons you might want to use OpenDNS, the biggest two I use it is for speed and security, here I will show you how you can set it up on your Mac:

1. Open system preferences and click “Network”



2. Select your network interface and then click on “Advanced”. If you don’t know what network interface you are using, then it’s the one with a green circle next to it, in my case “AirPort”



3. Once in advanced click the “DNS” tab



4. Finally, add the following IP,s: 208.67.222.222, 208.67.220.220