TOPIC: group registration button

When people are attempting to edit their registrations for my event it says: "To submit changes to your group, you must click the Next Step button below. If you need to make any group member changes, first click the Edit Group Members button. After making your changes, click to return to this billing page and proceed to complete changes."
I cannot find an edit group members button. Basically people in my event are registering up to 12 people for a team and I have it set up so that if they want to add an additional person they can choose that and then those fields associated with that question will come up. Those fields don't come up right now when someone has logged back in to try to edit their info. The fields do come up when they are initially registering.
Thanks so much for your help.