Very late update but came across the post and configured it myself with the below settings:
Service: custom
Protocol: DynDNS 2
Server: updates.opendns.com
Username: <user>
Password: <pass>
Hostname: <Your network label from OpenDNS>
Service: custom
Protocol: DynDNS 2
Server: updates.opendns.com
Username: <user>
Password: <pass>
Hostname: <Your network label from OpenDNS>