Under Categories select Apps and browse or search for Media Player. Install the Media Player application.
Go to the Media Player application, select HDHomeRun DMS xxxxxxxx, then either Channels or Favorites, then the channel you wish to view.
To add channels to favorites go to the Channel Lineup webpage of your HDHomeRun and tick the star beside the desired channels.
The streaming of high bandwidth video over WiFi will vary depending on the WiFi router and WiFi conditiions. Best results will be achieved using a wired network. For Wifi to work for high bandwidth video the router must support 802.11n or 802.11ac and the XBox One must be within reasonable rnage of the router.