1. Open the app and click on the "Security Settings" button
2. Click the "Passcode" button
3. Place a check mark next to 'Enable'
4. Type your four digit passcode using the on-screen keypad
Note: The app will not ask to confirm the pin, but it shows the numbers as you type
5. Click the 'Save' button
Now anytime you want to access the app you will need to enter this PIN.
The app will stay unlocked for ten minutes, before locking again, to give you time to make changes to the app.
Note: The passcode locks the main menu of this app, but it won't lock the device or prevent the app from being uninstalled.