Can you change the dates of your pass?

Hi, i booked my pass from July 15 to Aug 14 in 2027. When i was activating the pass, I saw a message saying that the date can be changed up until the day before the pass activates. But now im not able to change it. I rlly wish i took a screenshot back then. Im just scared that if I find a good time in winter, I won't be able to change the dates