Tried search and I also tried figuring it out on the webpage myself, but I'm completely new to rental cars and was not capable. Plus it seems the Sixt Plat card is unknown to the Sixt website:

How do I make a booking using my Sixt Plat, hence seeing the 35% discount? Plus I don't know how to distinguish between a "holiday rate", a "discountable rate" and potential other rates. When I type in my location and dates, it gives back a flexible and an early booking rate and that is the only differentiation.

Any help/explanation would be greatly appreciated. Also a point a more appropriate thread where to post this. I must shamefully admit that I did not yet read thru the entire thread as I didn't have time yet. I will however within the next few days, so if somebody knows the answers are in this thread, just point it out.

Thanks.