Tips on Customizing Instant Articles for WP

How to Hide the "Instant Articles" Admin Menu

function plt_hide_fb_instant_articles_menus() {
	//Hide the "Instant Articles" menu.
	remove_menu_page('instant-articles-wizard');
}

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

Where do I put this code?

How to Hide the "Facebook Instant Articles" Meta Box

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

	//Hide the "Facebook Instant Articles" meta box.
	remove_meta_box('instant_article_meta_box', $screen->id, 'normal');
}

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