How do I enable Closed Captions on the app for Roku?

In the app or channel, go to Settings.
In Settings, press the Closed Captions button to toggle closed captions on and off.

Alternatively, you can simply press the asterisk (*) button on your remote while you're playing a video to enable or disable closed captions.

If you have any additional questions about closed captions, please visit http://media.viacom.com/accessibility.