I read the instructions, and help with FAQ to change travel day: I start in 2 weeks. I first had first travel day on 15th, but I can only start the 16th, and I need all of my travel days at the end of the journey. I cannot find where to change this date, on both mobile app and on website.
You have to delete all journey´s that are connected to the pass on the 15th and connect them then for the 16th 
My suggestion at Journey´s last minute to the pass as you doesn´t know what happens on your way from the Hotel to the station and you can´t cancel a travelday on the date it issued for.
Means if you have 15th June as travelday you can cancel it only till 14th June 23.59 :)
I think you can just go to My Pass, select the first travel day and then tap on "Cancel travel day”. It should then also deactivate all journeys for that travel day and deactivate your pass if it was your first travel day.
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