Using Code Snippets with Mailpoet

Never mind, I worked this out by trial and error.
For your information I list the codes below (in PHP snippets)
You can see what I’m using and not using (unset)

add_filter( 'mailpoet_manage_subscription_page_form_fields', 'mp_remove_manage_fields', 10);
function mp_remove_manage_fields( $form ) {	

	//unset($form[2]); // Status Dropdown
	unset($form[3]); // message
	unset($form[4]); // List Selection Dropdown???
	unset($form[5]); // news letter option
	unset($form[6]); // comment
	unset($form[7]); // write your comment here
	unset($form[8]); // your lists 
	//unset($form[9]); // save button
	//unset($form[10]); // unknown

	return $form;
}