When you log in to the app, it will ask you for a pin, this was set up when you first logged into the app.
If you ever forget your pin, you will see a circle at the bottom of the pin pad, if you click this, a box will appear advising forgot your Passcode? If you Press "Login", it will sign you out of the app. Then follow the article link on how to get logged onto our app. This will help you set up a new passcode.