Go to your Parkster account and log out. 
Tap 'More' in the bottom right corner and then tap 'Log out'.

Open the app, select the country where you want to park, and tap 'Get started!'

Set up your direct payment method by tapping 'More' in the bottom right corner and then tapping 'Choose payment method'.

Enter your license plate(s) under 'Vehicles' and 'Add new vehicle'.

Now you are ready for Express-Parking.
After opening the app, tap 'Get started!', select your zone, set the expected parking time, and start the parking process by tapping 'Select vehicle and park'.

A service fee of 0.50 EUR per parking transaction will be charged for Express parking.