For a wireless home network you need an internet connection, a device called a Wireless router or Wireless access point and at least one PC.
The router appears under a certain name (SSID). When scanning for a network you may see several names, both your router's and those of neighboring houses or apartments.
In the list, select the router you are sure is yours.
You may need to enter the security password you have set for your router (consult your router's user manual). If you don't see your network, check it has its wireless function enabled.
If it is out of range, try to reposition the router. If radio interference does not allow a good connection, use a wired connection (UTP cable) between the TV and the router.