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How do I call the template tag?

You can call the template tag in two ways. The first uses a string as a parameter, and the second uses an array:

wp_list_authors_plus( 
'order_by_posts=DESC&excluded_roles=editor, contributor&excluded_ids=1&excluded_usernames=onion'
);

wp_list_authors(
    array(
        'order_by_posts' => 'DESC',
        'excluded_roles' => 'editor',
        'excluded_ids' => array( 1, 2, 3 ),
        'excluded_usernames => 'admin'
    )
);