Orange light means the WAN connection failed, did you connect PC to the modem directly and check the internet? Can try restart modem and router and see if that helps. Or you can contact TP-LINK...

Advanced Setup > WAN Service, click Edit for the WAN interface, then you can see NAT and Firewall, not sure if it's the correct place, but seems only this one about NAT and firewall.:p

Is the router connected to the modem by cable or wifi? If it is by wifi, how far is it from the modem? Can you still connect to the modem's wifi and get internet? How about if you restart the modem...

Did you refer to this link? http://uk.tp-link.com/faq-227.html Normally the IP address of the TL-WR940N should be the same segment, if your virgin media is 192.168.0.X, then the TL-WR940N should be...

Normally around 20 or less. If there are more clients, it's better to use higher standard or business router.

There is SD Card settings under Advanced settings of the camera's interface. I found it from their emulator http://www.tp-link.com/resources/simulator/NC450-emulator/index.html You can log into your...