In the web application click the 
Search button on the toolbar.
In the desktop application:
Select the User > Search main menu item.
Press CTRL+F or CTRL+F3.
The tool supports interface of Foresight Analytics Platform 9 or earlier.
To search for a user in the Users section:
In the web application click the Search button on the toolbar.
In the desktop application:
Select the User > Search main menu item.
Press CTRL+F or CTRL+F3.
After executing one of the operations the search dialog box.
See also:
Creating User Accounts and Working with Them | Deleting User