I reserved two seats on the Bernina Express. Then I purchased two 4 day flex pass tickets. I now want to link them so that the passes will cover the train fees, but I cannot figure out how to do this. I get as far as add your 10 digit customer number, and I don't see it anywhere. Can I bring the paid up reservation seat receipt and my paid up swiss pass printouts to the train? I try to call but it's not in english. Can anyone help me??

Validate your Swiss Travel Pass Flex the day you use it and board the train together wirth your seat reservation ticket.

Thank you