Noth43:
I've seen a post from the Ed stating that AB would rather that people didn't use ad blockers but then actually recommending Adblock Plus to anyone who chose to do so!
Jae1000000:
Type 192.168.1.1 into the address bar of your browser (and click 'Go'). That should take you to a password-protected page. If nobody has changed the default settings, enter 'admin' as both the username and password. (NB: If 192.168.1.1 doesn't work, 192.168.0.1 should do so)
Then follow the instructions here:
https://store.opendns.com/setup/device/dlink-dsl-2640
(The default username and password are both 'admin').
Chris