Visit your Smart TV's Network Settings, Network or Settings menu.
Select the WiFi or Wireless option and wait for the device to scan for available wireless networks (sometimes referred to as access points).
Select your WiFi Network Name (also called an SSID) from the list of available networks.
If your in-home XFINITY network does not appear on the list of available networks, you may need to choose the Search or Add a Wireless Network option. When prompted, enter any relevant information, such as the network name, password or security type.
When prompted, enter the Password (also called a Network Key) using the keypad on the remote control handset or onscreen keypad.
If you recently changed your WiFi network name and/or password, you will need to repeat the above steps for each WiFi-capable device on your network.