Here you can watch your video on the left and make edits to the transcription of the video on the right.

Click in the section on the right that says TinyMCE to activate the section.

Click Save Changes before leaving the page.

Note:

I suggest watching the video and pausing it to find the changes that need to be made on the right.

If you find a term or word on that needs to be changed, pause the video.  Then hit CTRL + F to search for the term, or follow along with the video as you read through the transcript.