Change Audiotracks when playing mkvs via usb

[Kiesel]

Hi,

I know that this must be a really stupid question, but somehow I cant figure it out alone.

I am having a mkv with 2 audiotracks which plays nicely via usb. Problem is, I cant change the audiotrack. I googled a lot and read the manual for the tv (D5700) but everywhere people are just saying that changing the track is no problem. So, could anybody please tell me how to change the track (without mkvtoolnix).
Thanks A LOT! And I am really sorry for the noob question!

Best regards,
Kiesel

[Spoza]

I can just press TOOLS button on my remote while the videofile is playing, then use left/right arrows to select the audio track selection icon and select the desired track.

[Kiesel]

Hmm, I dont have that change audiotrack button. There are two grey icons I cant reach (because they are grey), but I know that video has at least 2 audio tracks...:/