Course Press Discussion Enabled?

Hello,
I'm having trouble setting up a Discussion in a course. Is the process new?
The discussion should be in
http://f4d.33d.myftpupload.com/courses/how-to-write-a-joke-2017-january/units/unit-1-how-to-write-a-joke/page/3/page/3/
I don't see a button to add a discussion. Would you please enable it? Thank you!
Chuck