How do I manage comments for media in an Arc account?
If you are the owner of a video or audio file, you can delete comments in any media that you own. Comments cannot be edited except by the user who created the comment.
Note: Deleted comments cannot be recovered.
In your Arc account, locate the media you want to view. You can view specific media in the My Uploads menu , or search for the media in the search field .
Hover over the media and click the media thumbnail.
If your media has been uploaded to multiple courses, you can toggle the course by using the Course Filter icon . Select the course you want to view  to display the comments and insights unique to that course.
Click the Comments tab.
To delete your comment, click the Delete icon , then click the confirm delete link .
Note: Deleting your comment retains your name and shows that the comment has been deleted. Deleted comments cannot be recovered.