To enable closed captioning while watching a program, hover over the bottom right corner of the video player. When the player controls appear, click the Closed Captions icon to toggle captions on or off.
If you would like closed captions to always play on programs, you can enable them in account settings.
iOS and Android phones and tablets
Step 1:
Select the Account icon at the bottom of the screen.
Step 2:
Select Settings.
Step 3:
Toggle Closed Captions on.
Closed captions will now play automatically on all programs.