You'll need an account with Parkmobile or RingGo app. You can create one on the Parkmobile or RingGo website.
If you have already created an account and you forgot your password, you can reset it by clicking 'Forgot password' in the app or on the website of Parkmobile/RingGo.
Note: if you have only signed in for the ParkBee newsletter and parking credit, you have not made an account for the Parkmobile/RingGo app.