To comment or post a followup question to a Q&A post, please click within the text box beneath the post that reads "Compose a new followup discussion."

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:

You and your classmates can resolve a followup by selecting Resolved just above the followup, as seen below. Should you have additional questions, you can always mark the followup back to Unresolved again. 

If your instructor has disabled the Resolved/Unresolved toggle, you will not see this feature.

You can use the helpful link below a followup post to mark it as a good contribution:

If you'd like to keep track of the number of followups in a post, click on the gear icon in the top righthand corner of your Q&A feed and select Show Followup Count