Samba Server Users

The server I inherited at my shop is accessible using one username with the same password on all the computers in our network. I am trying to set up a server at another location and need to do the same thing, but for the life of me cannot figure out how to replicate that. Any help?

There is a point during installation of the OS that
you are prompted to create users. If the system
is already installed, you need to become root,
and run useradd or adduser command and
passwd command. to create user and assign
password.