When you open the app, you'll be taken to your Dashboard page. This shows you an agenda-style view of your upcoming shifts. You can scroll up to see your past shifts, and scroll down to see future shifts.
In the top-left, you'll see three horizontal lines. Tap on it to open up the Main Menu and go to a different place in the app.
In the top-right, there's a bell icon - tap on that to get to your notifications.