So here's how to block access to the interwebs. No pictures since I don't have time to get them.
Go to the IPCop router homepage and login
On the top go to Services then Advanced Proxy
Scroll down to Network Based Access Control
Under banned I.P. address enter the I.P. you want to restrict access and then scroll down and press Save and Restart.
Here is the I.P. chart. All the desktop I.P. address are up to date.
Note: the three laptop I.P. addresses are (from right left) 117, 128 and 124.