Change password on Dell Force10 S50N

Hi,

I have a Dell Force10 S50N switch which has a username (it is not 'admin') and a password I know. I can access the CLI via SSH. I need to change that user's password but I don't know how and can't seem to find much information on how to do it online.

I have little experience with switches (any brand) and have just been handed one over and now I need to change the password.

This is a production switch, so can't really reset it to factory defaults or reboot it.

Can anyone help me?

Thanks.