Using OpenDNS

[#1]

Hi,
Just joined plusnet with Fibre Broadband. So far all is good. 
I run a small home network with a server for the family and my one-man-band business.
I have the Technicolor TG582n router.
I want to use openDNS as they provide content filtering at a DNS level. I know it is not fool proof but at the moment it meets my needs and filters all traffic regardless of the device (iPad, phones, tablets and PCs) and if you have a static IP you can create whitelists.
Does anybody know how to change the router to use a different DNS server. I tried through "Technicolor Gateway > Configuration" , but it would appear the feature to use your a different DNS is disabled.
Thanks
Mike

[#2]

You have to do this using the router's command line interface.  Info on this (and lots more) here:
http://npr.me.uk/telnet.html#dnsr8
Another option might be to disable the router's DHCP server and run one on your server perhaps?

[#3]

Thanks, I am away for a week but will give it a try when I get back