If you have a Wi-Fi enabled box*, you can change the settings so that it can connect to the internet wirelessly.
Setting up Wi-Fi on the box:
Press the Home button on your remote
Select Settings (a cog icon on the top-right corner when the Menu is open)
Select ‘broadband connection’
Select ‘Change connection’ and follow the on-screen guidance
* Wi-Fi is currently only available on the BT TV Box Pro