You can have an unlimited number of users for each host. When you add a host to the server, you select the user database for the host: the WS_FTP Server internal database, Microsoft Windows, or an external ODBC user database.
If you selected the Microsoft Windows or external (ODBC) user databases, you may already have a list of users for the host. In this case, you cannot use the WS_FTP Server Manager to add or delete users, but you can set additional user options in the Host Details page in the User Settings section.
If you are using a user database other than the WS_FTP Server internal database, you must use the other database's method to add or remove user.