When you run the application, it will bring up a Connect dialog which you can cancel out of — unless you are actually accessing Mac OS X Server.

To access the local host’s users and groups, select “View Directories” (command-d) from the “Server” menu. It will probably bring up an alert warning you that you’re working on a local, and not network-visible, database — which is what we want.

The icon tabs on the left of the window that comes up allow you to view the users, groups, and some other things we don’t need on Mac OS X (but which are relevant if you’re running Mac OS X Server). To make any changes, you have to click the lock button near the top right of the window and enter an admin user name and password.