The sections of the "Users" module
Tree
In the left pane of the "Users" module, you'll see a representation of the organizational structure, shown here in "Tree" view.
In a newly created portal, you will find only the portal node (1) and the "System" subfolder (2).
You can switch between the different views using the "Tree," "List," and "Search" buttons (3).
In the middle section (4), you'll find a list of users, user groups, distribution lists, etc. - in short, all existing user objects. The list is sorted as follows: Type, Enabled, Priority, Name. You can change the sort order by clicking on the header of a table column (e.g., "Name").
You can use the filter buttons (5) to filter the list by the various object types. You can find more information about the filters here.
You can search the list to the left of the filter buttons. To do so, enter your search term in the search field.
If an object class is selected in the organizational structure, all relevant objects are listed in the central pane. You will be provided with the object's name, description, type, and priority. In the "Type" column, you'll find the object class to which the object belongs.
In the tree view, you can use the "Edit" option in the main menu to search for the occurrence of the currently selected object in the tree structure. The result is then displayed in the search window. You can change the structure of the tree using drag-and-drop or by selecting "Move" from the main menu.
List
Here you can see the "Users" module in list view. When you click on a class, the objects of that class are displayed in the object list in the middle pane. The list is sorted as follows: Enabled, Priority, Name.
In the list view, you can customize the table columns using the "Define Table Columns" context menu option.
Select Table Columns
All available attributes that can be included as columns in the table are displayed on the left.
Move to the right / left
Moves the currently selected attribute from one list to the other.
Move up / down
Changes the order of the table columns. The following rule applies: the higher an attribute is in the list, the further to the left the corresponding table column will be displayed.
Search
Here you can search for individual properties. Select the object type from the "Type" drop-down list and enter the search term in the search field. When you click "Search" at 
, all search results are displayed in the middle section.
When you hover over a result with your mouse, additional information is displayed.
Pressing the "F4" key displays all information about a specific object—such as its GUID and ID—in a dialog box. You can also select "Details" from the main menu when an object is selected.
Details
If necessary, you can use the "View" option in the main menu to display the details in the right-hand pane of the module. Here, you'll find information about the attributes of the currently selected object.
Search Window
You can use the "Edit / Search for Instances" option in the main menu to search for instances of the currently selected object. The result is displayed in the search window at the bottom of the module. Double-clicking a result opens the corresponding location where the object appears in the structure in the central pane.
The search window can be shown or hidden via the "View" option in the main menu.
More Information
Objects, Classes, and Attributes
Replication - Importing Users and Groups
Active Directory Integration and Replication Configuration