How do I edit or delete discussion replies in Discussions Redesign as a student?
If your instructor allows, you can edit and delete your own discussion posts. If the edit or delete option does not display, your instructor has restricted this setting in your course.
Note: This setting does not affect discussions in course groups.
Edit Discussion Reply

Locate the reply you want to edit and click the Options icon [1]. Then select the Edit option [2].
Delete Reply

To delete your reply to a discussion topic, click the reply Options icon [1], then select the Delete option [2].
View Reply History

If students are allowed to edit their discussion posts, you can view the edit history of their post.
To view the history, click the View History link [1].
In the Edit History window, you can view any version with the date and time stamp of the student's post [2]. To expand all of the versions, click the Expand all button [3].
To return to the discussion, click the Close button [4].