Log in to your Portal1791 account and click on the "Appointments" tab. Locate the scheduled appointment and click the "Actions" button on the right-hand side, then select "Edit Appointment" if you would like to change the date, or select "Cancel Appointment" if you no longer intend to use the library. If you select "Cancel Appointment," you may submit a new appointment request at a later time. When you cancel an appointment, all requests associated with that appointment are also cancelled, but you may still access information about those requests form the "Request History" tab in Portal1791.