Your WPA is the router key and usually found underneath the actual router itself. See the attached article about your router.
If you cannot find this go into your router by typing it's IP address in the address bar - in your router's case it is 192.168.1.254 - you will then need to enter your username and password - if you haven't changed these then they could be admin and password or admin and leave password blank.In your router's settings, look for a "security" or "wireless security" tab. Open this tab, and the WPA key should be displayed.
You say "no" to proxy server.
Don't know whether you have downloaded the set up instructions for the tv but you can find them here.