This feature is not enabled by default. Only Administrators can activate this feature.
When you want further discussion on a question rather than getting quick replies from Answers, you can make that question posted in Forum as a new topic. The topic created in Forum will have the same title and content as your question in Answers. All the comments will become posts in that topic. Once there is a new reply in that Forum topic, your question in Answers will be updated correspondingly.
Discuss or view the question discussion
The first way
Open the question and click
on the top right of the question pane.
The second way
Right-click a specific question and select Discuss in Forum.
The topic posted in Forum needs to be approved by the administrators or moderators before you can view it. To go to that topic, right-click the question title and select Discuss in Forum from the drop-down menu again.
See also