Discussions allow everyone on the project to exchange ideas and give feedback. They let you leave comments, send replies from your e-mail or even make a task from a discussion.
Open the Discussions tab in a project.
Click + New Discussion.
Enter the name.
Click Create Discussion.
All subscribers will be notified about this discussion (learn more).
Open a discussion.
Enter a comment.
Attach files (optional).
Click Add Comment.
All subscribers will be notified that a new comment has been posted.
Add people to the discussion by @mentioning them (eg. by typing @John) in a comment. This will automatically subscribe them and notify them about all future comments as well.
Open a discussion to see or edit the details. Clicking on ... will let you: