Accessibility Captions in Character Animator

Hi There, 

Is there a way I can add captions for the audio of my character in Character Animator? Or will this need to be done in a different software? I swear I saw a box where I could input the text for the audio but it's now gone and I can't seem to find it to bring it back open. 

Any help would be appreciated, happy to do it in an external software but it's always better if I can do this in the same application.