Once DirecTV has been selected, the touchscreen will change to display media controls. There are 3 tabs at the bottom of this screen specific to this input: Favorites, Keypad, and Remote.
Favorites
The Favorites tab shows a list of pre-selected favorited channels. To select a channel, simply scroll through the list to find the channel then tap to select it.
List of favorited channels for DirecTV, to be scrolled through and selected.
Keypad
If the channel you wish to view is not listed in the Favorites list, you can use the keypad to type in the channel number and navigate to it.
DirecTV controls, mimicking numerical keypad buttons.
Remote
To more fully control the DirecTV system, the remote tab mimics most of the other buttons on a DirecTV remote.
DirecTV controls, mimicking various keypad buttons.