Creating Graded Discussions

dawsonh1
Community Novice

My university is make the very difficult transition from Blackboard to Canvas. I am very much lost and am not finding answers in the instructor guide. While I have found everything about Canvas to be challenging so far, my current concern is creating a graded discussion. I have followed these instructions in the instructor guide and am still unable to create my discussion. When I click "save and publish" I receive a message to "Select an Assignment group." Why am I getting this message? What is an Assignment group? How can I select an "assignment group" if there are none listed in the dropdown menu?  I can't seem to find anything to explain what this means....Here is a screeshot, any direction that someone could offer would be greatly appreciated.

271589_Canvas problem.PNG