Most views in the app provide you with an Info button in the navigation bar (at the left in most cases). It provides you with more information on using the app.
At the bottom of most windows you'll find a tab bar with tabs to left you go to the Overview for your project (you can enter the data you want) as well as the Risk List, the Resk Register, and the Mitigation Log.
If you are using iCloud Drive (which we strongly recommend!), you 'll be able to switch among your projects, each of which is in a separate iCloud document. You can use iCloud to view those documents, send them to others, archive them as needed. To use an existing document, drag it to your iCloud Drive NP Risk folder. It will appear in the list of your projects.
If you do not have iCloud Drive, you'll be able to use the app for a single project.