To comment or post a followup question to a Q&A post, please click within the text box just beneath the post that reads, "Compose a new followup discussion."
All post contributors, as well as any others following the post, will be notified of a new followup. Only instructors and the original author can edit a particular followup, but anyone can comment on it or reply to it.
When a new followup is posted, it will automatically be set to "Unresolved," and an icon reading "1 unresolved followup" will display beneath the post in your Q&A feed, as seen below.
Individual instructors and students can resolve a followup by selecting "Resolved" just above the followup, as seen below. However, any user is able to mark the followup as "Unresolved" again should they have additional questions.
To reply to a followup, simply type your response into the text box beneath the followup itself.