The TV is advertised as "WiFi Ready", not "WiFi Built in". What that means is that it
does not have WiFi without a WiFi adapter that you have to buy separately.
I plug my Panasonic directly into an Ethernet router. That works great.
I can stream movies directly from providers like Netflix and Amazon.
But since I have never had a need to get an adapter I have never
used one. I suspect it would work like my Ethernet cable.
Plug it in one of the USB ports, log-on to your wireless router,
hit the Internet button on the controller and your good to go.
Here is a sample adapter: Panasonic TY-WL20U Wireless Adapter for
Panasonic 2012 Internet Ready TVs