In the player, you can activate an available subtitle or alternative audio track as follows:
Tap the Touch surface to open Player Controls > Swipe up > Swipe right and select the speech bubble icon for subtitle options.
Tap the Touch surface to open Player Controls > Swipe up > Swipe right and select the loudspeaker icon for available audio tracks > Select language.
Changing the audio track or activating the subtitle is available for programs if provided by the TV station for a specific show. This is not the case on all channels nor for all programs. Only if the option is available, you will be able to switch to another audio channel or activate the subtitle.