How do I cancel my Fast Pass reservations?

[ladybugchick806]

I just can't figure this out! I made FP reservations and now my plans have changed and we won't be at AK that specific day. Help!

 

[tcherjen]

I went back in and select a different park and changed my selections. I also was able to change selections for the two teens in our party. I just kept playing with it. It is a little confusing...