Once complete, plug a cat5 cable into the ethernet port of the WD TV and the MacBook
The Macbook will now assign an IP address to the WD TV
I assumed that the IP address would be next in line (192.168.2.2) - Just connect to this IP address in Safari (or any web browser)
That is it - you can now control the WD TV using the browser interface.
NOTE: if your WD TV does not respond on 192.168.2.2 you can keep trying 192.168.2.3, 192.168.2.4, etc… or simply download an IP address/port scanner tool to search for the connected device.