@josefkriegl if you sign in to your profile and click Travel at the top of the screen, you will go to your Travel home screen. From there, click the Upcoming Trips tab. There you will see your trip as a hyperlink. Click the link to open your itinerary. You will see all the details. In the Car details, look for a link that says Change. This is how you can change the car. However, I've not ever needed to do this myself, so I don't know if it will allow you to change the car type or just the dates, but that is how you access Changing your trip.
Thank you,
Kevin
SAP Concur Community Manager
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