New DNS entry will not take effect

[Wade Smart]

20080728 0744 GMT-6

Yesterday I changed my dns to opendns. I opened the network gui and put in my 
opendns addr's but when I went back later, they were not there.

Then I found a post on this:
sudo gedit /etc/resolv.conf

and tried that and still, it did not take. Found another post saying:
sudo gedit /etc/dhcp3/dhclient.conf

and add:
prepend domain-name-servers 208.67.222.222,208.67.220.220;

which I did and still it did not take.

Im not sure what is up here but surely I dont have to use my ISP's dns.

Wade