1. Go into edit mode on your workspace by clicking the "Edit" tab.
2. Click the "Insert Plugin" button.
3. Choose "Recent Visitors" in the "Page Information" category.

   

4. Here, you can choose how many recent visitors the plugin will display.  Set your preference and click Preview.

   

    

5. Then click "OK," and now "Save" your workspace page. 

You will now have a list of recent visitors to your workspace, starting immediately (the plugin will not be able to pull data on past visitors).