Problem with mine: It seems that it doesn't have a place to put DNS numbers.
I made screen shots to show the guys on the OpenDNS forums. It is difficult to show every corner of the settings provided by my modem/router. If what I show isn't enough please request more. And I'll make more pictures.
In order to save time and energy I showed the places I thought it might be first. That place was in the "Advanced Settings", But One of the guy's in the forum wanted to see "Main" first. I made screen shots showing everything under the top headings. Then I showed more stuff under the "Advanced Settings" because I think, if it's under anything It would be under that. Besides all that, it was the only place where I could find anything called "DNS"
*Note: I blocked out the IP addressed for Privacy.
SCREEN SHOTS FROM ACROSS THE TOP: