Open the youtube video, then click on the screen to stop the playback. Look across the bottom of the screen. You should see an icon that looks like “[cc]” without the quotation marks near the right hand bottom, about 1/5 of the way in. Click on that, and automatic captions will appear on the bottom of the playback screen. Allow the video to play, and you can read and “hear” the video.
I hope this helps.
Thanks a million!