Instructors can, at any time, lock (or unlock) a topic. When a Topic is locked, students can read the Topic postings but cannot post new Conversations or Replies to the Topic.
Go to Forums.
To the right of the Topic you want to lock, click Topic Settings.
This displays the Topic Settings page.
Under Topic Posting, click Lock Topic.
Click Save.
Note: Instructors can unlock a Topic at any time.
This returns the display to the Forums page with the Topic locked.
When an instructor or student clicks on a Conversation, it is displayed with no New Conversation or Reply buttons.