For most videos on Hotpot TV, you can change the subtitle language, size, and appearance by clicking the "cc" button in the lower right hand corner of the video player. Here you can turn subtitles on or off, and choose your subtitle language. Go to "Captions Settings" to change subtitle color, size, or background.
Some videos on Hotpot TV are displayed through the Youtube video player. To turn subtitles on or off and see other available options, click the gear icon in the lower right hand corner.