The access to your Ledger Blue is protected by your PIN code, required each time it is powered on, or unlocked. The dashboard displays all the applications that are installed on your device. Tap an icon to open an app. You can navigate using the menu icon. Tap the arrow on same area to go back. Tap the “dashboard icon” on the top right corner to quit an app. The settings application allows you to change parameters and personalize your device. As for each app, tap the top right icon to exit.