If your router model isn't close to the other versions, please use this general guide.
Disclaimer:
Due to the wide variety of devices available and potential variations in their firmware, the information presented below may or may not be accurate. For this same reason, OpenDNS support will generally not be able to provide device-specific assistance beyond what is provided below. If you need further assistance specific to your device, please contact either the manufacturer's support team, or your ISP if you are using leased equipment.
1. Log in to the router interface
Visit 192.168.1.1 and log in to your router with the username and password.
3. Enter DNS Numbers
Enter the following OpenDNS IP addresses in the Primary and Secondary fields.
Our DNS IP's follow:
208.67.222.222
208.67.220.220
4. Save your settings by clicking Apply
After clicking Apply, we highly suggest that you flush your DNS resolver cache and web browser caches to ensure that your new DNS configuration settings take immediate effect.