There is not a lot to it. Use it pretty much like you would Explorer that comes with Windows.
It is also very similar to Telephone Extensions List 3.0, though it has a larger menu and some toolbar buttons. To edit a specific user double click over the required entry.
You can sort the list by clicking on the "Header buttons" (they are the ones at the top of each column). The Icons and other details are the same as "Show Extensions" except that all users and headers are shown, irrespective of the "Show All Users" setting.
The button will move to the left column and the list will show the list of users and extensions in the order of the item you have clicked. If you press Extension you will see the list ordered by extension, if you press Login Name, you will see the list ordered by Login (or User) Name.
Click on an entry, or type some text to move the cursor to a particular entry. A double click with open the Edit User Details Window.