i believe the network connection on this TV is for updating the TVs software over the internet
Is that what you're trying to do?
As far as I can tell this TV does not include a web browser so is unable to do that I'm afraid
It's not referred to as a smart TV on Panasonic's website:
According to the manual, pg 21 it's so that you can update the TV's Software
Did the advert or shop tell you it could connect to netflix?