When you press Menu, on mine, a black square comes up with, Picture, Sound, Channel, System. support. I scroll down to System and a blue square come see up up with, Setup, Time, Language. The further down is Subtitle. Press the "right" button and the same thing happens. Scroll down to subtitles and Bobs your Auntie.
You might have to scroll right or left for your settings but there,Will, be the ability to change it. Let me know.