How to disable a passcode lock?
To disable a passcode lock
1. Open the Bigin app on your iPad.
2. Tap on Settings 
at the bottom right of the screen.
Under "Manage Privacy", you can find the title "Privacy & Security".
3. Tap on Privacy & Security > Passcode Lock.
4. Enter the current passcode.
5. Select "Turn Passcode Off".
6. Enter your current passcode once more.
Info: Once you've disabled the passcode, the next time you tap on the Bigin app icon to open the app, you won't need to use a passcode to enter the app.