Hi. I would like to start using this site as a seller but I would like to change my username. Does anyone know the character limit? New name would be 14 characters. Thanks!
A username can be 15 characters max.
In addition to what has been said you are unable to change your username once you have created an account.
You need to contact the CS, because you can not change your username the moment your account is created. If you contact CS, you might be enabled to change your username.