In the web application, click the 
Delete button on the toolbar.
In the desktop application:
Select the Remove item in the object's context menu.
Select the User > Delete main menu item.
The tool supports interface of Foresight Analytics Platform 9 or earlier.
To delete the selected user in the Users section:
In the web application, click the Delete button on the toolbar.
In the desktop application:
Select the Remove item in the object's context menu.
Select the User > Delete main menu item.
After this a confirmation dialog box opens. Select Yes to delete the user.
IMPORTANT. The user on the database server can be deleted manually.
After the user is deleted credentials of the user may be requested, who has administrator permissions at DBMS server.
NOTE. When roles of information security administrator and application administrator are separated, only the application administrator can delete users.
If on separating administrator roles the users who have access permissions for repository objects are denied to be deleted, on an attempt to delete such a user the application administrator (or the user who holds the Creating and Deleting Users privilege) is warned that the user has access permissions. Deleting such a user requires removing all available access permissions.
See also:
Creating User Accounts and Working with Them | Viewing Connected Users