Would like to use MAC address filtering

[Golfer]

I have that same router dave. If you can't locate the MAC address in the System Profiler, go to router's setup page using your browser of choice. In the list on the left hand side, click on DHCP Client List. You should see you dad's computer and MAC address in the list. Copy the MAC address then in the left hand side list click on MAC Address Filtering. Check the box to enable filtering, paste the address in the appropriate window and click add, then click Apply Changes and you should be good to go.