I tried Googling this as well as looking at this forum, but couldn't find the answer. I've got a party of 5 people and I plan on making all of the initial FP+ reservations, but I was wondering if any of the other four can modify/add FP+ reservations as well. I'm mostly interested in offloading the responsibility to deal with things once we're in the parks, so I'm hoping anyone in the party can do this for any/all of us.