The following tutorial video shows you how to use Folder Manager to include any folder in Picasa’s View. Also to exclude folders from Picasa’s view. If you want to watch another video on the same subject, try this older one: 153.Picasa’s Folder Manager.
Picasa gives you two main ways to see your pictures, Library View and Single Picture/Edit View. This video explains the purpose of each and how to navigate in them.