Hi CHO1
We cannot make any changes on a ticket once the purchase has been completed. Therefore, please purchase a new ticket with the correct data and then fill out the following form to request a refund of the first order:
Contact form for refunds
If you keep having troubles to send the form, try to fill out the form using an other webbrowser.
Please note that, for each type of ticket, different refund conditions apply. If you have further questions please call us on +41 848 44 66 88 (CHF 0.08/min.) or +41 51 225 78 00.
Have a nice day. EllenvS.