Open the app and tap on 'Get started!'.

Do you already have a registered Parkster account?
Tap on 'More' in the bottom right. Under the button 'Choose your payment method', you will find the link to sign up. Tap on it, fill in your access details, and log in.

Don't have a registered Parkster account and want to register?
Tap on 'More' in the bottom right of the app and then on 'Choose payment method'. At the very bottom, you will find 'Create Parkster account'. Tap on it, fill in the required information, choose a password, and tap on 'Create account'. Follow the further instructions.