You need to add a project; it is very simple. Click on "Add Project"
The option to add a project appears in the second pane; enter the details and click on "Create" at the bottom of the page
Now if you are curious and click on the hyperlink "How to add a folder?"; the pop up window explains folders and how they can be used to organize your projects
Now just click on "Add Team"
You get a pop up window where you can type the team name and hit "Add Team"
Watch this video tutorial to know more.
Similarly, adding a discussion is also simplified
Type the discussion topic and hit "Add Discussion"