Editing Closed Captioning when using player topbar tab

Hi Everyone! This is a first for me...my client uses a file in the Classic format and has asked for edits to the closed caption. But, the closed captioning is not attached to the audio file as I am used to seeing it. Closed captions come from the Closed Caption option in the Topbar Right features in Player Tabs settings. How do I access that content? I have searched and searched!