How to configure openDNS on pfsense firewall

1. Create your openDNS.com account. Add your Network to their system, etc.

2. Go to the "System" -> "General setup" page.

3. Set the DNS address to the OpenDNS':

   208.67.222.222
   208.67.220.220
   

Now just make sure that "Allow DNS server list to be overridden by DHCP/PPP on WAN" checkbox is NOT checked.