Select the configuration.
Select the configuration from the configuration list. Click Configurations tab to get the list.
Click Access Control > Users tab.
Select the authentication database from which you need to delete the user.
Enter the User ID in the Search Users text box and click Search button.
Select the user from the UserID column and click Delete button.
Deleting users(s) from keyfile/digestfile authentication databases will delete the associated group(s) as well if the group(s) contain no members after deletion of the user(s). This happens because groups without members are not allowed for keyfile/digestfile authentication databases.
For deleting a user through CLI, execute the following command.
wadm> delete-user --user=admin --password-file=admin.pwd --host=serverhost --port=8989 --config config1 --authdb KEYFILE1 user1
See CLI Reference, delete-user(1).