Hi Gerald,
"Admin" is not a regular login account but you can log in as root with the system password.
Normal users get a special shell called "sshell", intended for retrieving email using SSH port forwarding. If you want them to be able to log in normally, you can edit the /etc/passwd file and change the shell from "/bin/sshell" to "/bin/bash" which will enable normal log in.
Good luck!
Kim