Hello Xiwhottea29
I cannot follow your saying as for this, you would have to tell us the travel date, departure time, and coach number. Only then we can retrieve the correct train equipment and seat map.
To make it short: to check if you can possibly change seats, and provided you purchased the tickets from SBB, please ring the SBB Contact Center: +41 51 225 78 56, 24/7, waiting times are possible.
Kind regards,
Roland