You can easily change both vehicle and personal data by logging in to My Page.
You cannot change the owner of the agreement. Exceptions are when submitting a copy of the probate/non-probate certificate which shows that the surviving partner/heirs are taking over the estate.
Be aware that changes you make to your SkyttelPASS agreement do not update information in any additional ferry agreements with AutoPASS for ferry and Bastø Fosen.