When you go to the online bank, select MobileSCAN/Digipass 780.
To log on to the online bank, you must enter your username  and personal code or mobile phone number into the log in field. Afterwards, press Continue, and you will be forwarded to the next log in step.
In the next step you will see a QR code, and you will receive a push notification on your phone. When you click on this notification, the Citadele app will open on your phone. Complete authorisation using Face ID, finger print or PIN code. The code underneath the QR code will be filled in automatically.
If you have trouble connecting to the Online Bank, take a look here.
If you want to reactivate MobileSCAN, see the instructions here.