The beauty of this feature is that you can create learning activities for any community right within the community itself. Choose one of your communities, and from your Learning Activities dashboard, click on the purple plus sign in the bottom right-hand corner.
From here you'll be prompted to create either a new learning activity or a new portfolio entry. Choose "Learning Activity" to get started.
This takes you to a new blank unit template where you can begin writing out the stages for your unit or learning activity.