OpenDNS working and not working at the same time

[#1]

Hi
I'm setting up OpenDNS.
If I configure it in my network connection everything works as expected.
If I set it up on the router using TELNET as outlined here http://community.plus.net/library/dns/how-to-change-the-default-dns-servers-in-a-thomson-speedtouch-... the test site says I'm using OpenDNS and the name resolution test works however it doesn't block "undesirable" sites.
In my router settings I have checked that there are definitely only the two DNS addresses which both point to OpenDNS and I've flushed the DNS cache (and rebooted the machine)  with no effect.
Is there anything else I should be doing or setting up?
Cheers
Samo

[#2]

In addition to setting  208.67.222.222 and 208.67.220.220, have you set up an account and set preferences in the 'dashboard'? https://login.opendns.com/?return_to=https%3A%2F%2Fdashboard.opendns.com

[#3]

Ah, I didn't know about that bit of it.....
I've set up an account and will do the networky bit when I get home tonight, then see what happens.
Interesting that it works successfully if it's configured on the network connection though
Cheers
Samo

[#4]

@'samo' - do you have a static IP address with Plusnet ?
If NOT you will need to use the OpenDNS dynamic address updater to keep the content filter in sync with your connection.
http://www.opendns.com/support/dynamic_ip/
Otherwise you could ask Plusnet for a static IP address (for £5 one off charge) if your broadband package allows it.
http://www.plus.net/support/broadband/products/IP_addresses_broadband.shtml

[#5]

Samo i use opendns family sheild, works perfect for us.
208.67.222.123
208.67.220.123
Blocks all the bad sites without going ott