If a title has closed captioning available, there will be a small box on right side of the screen with "CC" in the middle. You can click that to turn on the captioning! If the title you are viewing does not have that box, that means that captioning is either not available or has not been set up yet for that title.

Thanks for that answer. I too am interested in CC option, because I am totally deaf. I have a wifi that I use to feel the vibrations, but the show would be so much easier to enjoy if the items have CC, and as of now--the majority of your shows do not. :(