If a user does not need to access the application temporarily, you can modify the record to make that user inactive. If the user does not ever need to access the application, you should delete the user record. For example, if someone leaves your organization, you would want to remove that person from the application.
Note: If dual control is required, another customer user with Customer Users: Add, Edit, Delete permission will have to verify the record deletion before it becomes effective.
Choose Security | Customer Users.
Select the user to remove.
Click Delete in the Customer User Detail section bar.
Click OK.