Create New Synergetic User - Login Name window

Login Name

Windows authentication user login names must be prefaced with the domain name and a backward slash. For example, SMS_DOMAIN\tdawson.
SQL authentication logins are just the user name. For example, tdawson.

User to Change Password Next Login

If you are using SQL authentication, you can prompt the user to change their password when they next login.
This ensures the user changes their password at next login. This is useful if you have set up a temporary password for them.

Password Never Expires

If you are using SQL authentication, you can allow users to use the same password indefinitely, if your organisation's policy permits it.
This is useful as it allows users to control their password and when they change it, if at all. This avoids the problem of people writing down their passwords.