How to Hide WP Attachments Admin Menus and Meta Boxes - PluginTests.com

How to Hide the "WP Attachments" Admin Menu

function plt_hide_wp_attachments_menus() {
	//Hide the "Settings → WP Attachments" menu.
	remove_submenu_page('options-general.php', 'wpatt-option-page');
}

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

Where do I put this code?

How to Hide the "Media" Meta Box

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

	//Hide the "Media" meta box.
	remove_meta_box('wpa-attachments', $screen->id, 'normal');
}

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