How to Hide LH Instant Articles Admin Menus and Meta Boxes - PluginTests.com

How to Hide the "Instant Articles" Admin Menu

function plt_hide_lh_instant_articles_menus() {
	//Hide the "Settings → Instant Articles" menu.
	remove_submenu_page('options-general.php', 'lh-instant-articles/lh-instant-articles.php');
}

add_action('admin_menu', 'plt_hide_lh_instant_articles_menus', 11);

Where do I put this code?

How to Hide the "Send to Instant Articles" Meta Box

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

	//Hide the "Send to Instant Articles" meta box.
	remove_meta_box('lh_instant_articles-send_to_ia-div', $screen->id, 'side');
}

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