You can do this only if you have not passed the turnstile , and if it is allowed by the ski area, you can change the card number on which the skipass was previously loaded.
If not allowed by the ski resort, and after passing through the turnstile this action is not enabled.
To do so, visit How to change the Snowitcard number.
Please be aware that in the Chiesa in Valmalenco area, this option is not enabled.