Hello Monika91
Supersaver tickets are E-Tickets and these are issued to a named passenger and are not transferable. This is why you will also be asked to show your Half Fare travelcard or identity card when your tickets are checked on board the train.
If you have purchased a ticket for an incorrect person, it is possible to change it. You must be able to prove that you have purchased a new ticket for the exact same route and the correct person. Every exchange is with a fee of CHF 10.00.
Online-Ticket FAQ: https://www.sbb.ch/en/travelcards-and-tickets/buying-options/online/faq.html
Kind regards, ValerieS