Can I upgrade my 2nd class Pass to 1st class?
While it's not possible to pay the price difference to upgrade your 2nd class Pass to 1st class, you may be able to exchange your 2nd class Pass for a 1st class one. You can see how that works here.
Change of currency
You cannot change the currency once you have a Pass in your cart. Remove the Pass, and then change the currency on the website header.