Register in the SBB Community with your SwissPass login.
If you do not have a SwissPass login, you can create one free of charge on the login page. Then select your user name for the SBB Community.
Alternativelly you can also register with your Facebook login.
Register with your existing Facebook login. Then select your user name for the SBB Community.
I made a reservation for the train from Basel to Interlaken on 02.03 in 2019, but I entered the wrong one by booking one English name.I entered hyon as hyun. What should I do?