Yes, you can go back into someone’s registration and make changes as an event chair. After you login to the administrative area, you can view any registration, and go back into the form and edit anything you wish. If the changes you made incur a change to the registration fee, this will update automatically. If there have been any payments made against this registration, this will not be impacted, all that will change is the outstanding balance. At that time, you can click a button to send an updated statement.