Tips on Customizing GetResponse Form

How to Hide GetResponse Form Admin Menus

function plt_hide_getresponse_form_menus() {
	//Hide "GetResponse Form".
	remove_menu_page('GetResponse Form');

	//Hide "GetResponse Form".
	remove_menu_page('edit.php?post_type=getresponseform');
	//Hide "GetResponse Form → GetResponse Form".
	remove_submenu_page('edit.php?post_type=getresponseform', 'edit.php?post_type=getresponseform');
	//Hide "GetResponse Form → Add New Post".
	remove_submenu_page('edit.php?post_type=getresponseform', 'post-new.php?post_type=getresponseform');
}

add_action('admin_menu', 'plt_hide_getresponse_form_menus', 100);

Where do I put this code?

How to Hide the "GetResponse Form Creator" Meta Box

function plt_hide_getresponse_form_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "GetResponse Form Creator" meta box.
	remove_meta_box('getresponse_form_metabox', $screen->id, 'normal');
}

add_action('add_meta_boxes', 'plt_hide_getresponse_form_metaboxes', 20);