The first screen you see in the application. Table on left will display your previous sessions along with date, target type, and your short description entered on the session info screen.
Tapping '+' in the top right will create a new session.
Selecting an existing session in the list will let you see additional details on the right and edit the session with the button in the bottom right.
The 'share' button (top right next to '+' button) allows you to export the data for all saved sessions