To set a passcode
1. Open the Bigin app on your smartphone.
2. Tap the
More 
icon at the bottom right of the screen.
3. Select Settings
. 4. Look for the title Privacy & Security.
5. Tap on Privacy & Security > App Lock.
6. Select Enable App Lock.
7. Set a passcode.

Once you've set a passcode, the next time you tap on the Bigin app icon to open the app, you'll need to use the passcode to enter the app.