Please note: The appearance of TED.com on a mobile browser may vary greatly depending on your model of Android device. Subtitles may not be compatible with your device. Please consult your manufacturer for assistance if you are unable to use the following instructions to activate subtitles.
You should be able to activate subtitles by tapping the "three dot" icon in the lower right corner of the video player:
That should open a small menu with a "CC" option for captions and a selection of available languages.
Tap that button to open a list of all available languages. Tap your preferred language and the captions will automatically appear when you play the video.