Tips on Customizing GD Rating System

How to Hide GD Rating System Admin Menus

function plt_hide_gd_rating_system_menus() {
	//Hide "Rating System".
	remove_menu_page('gd-rating-system-front');
	//Hide "Rating System → Overview".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-front');
	//Hide "Rating System → About".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-about');
	//Hide "Rating System → Shortcodes".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-shortcodes');
	//Hide "Rating System → Settings".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-settings');
	//Hide "Rating System → Rules".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-rules');
	//Hide "Rating System → Rating Types".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-types');
	//Hide "Rating System → Ratings Items".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-ratings');
	//Hide "Rating System → Votes Log".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-log');
	//Hide "Rating System → Transfer Data".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-transfer');
	//Hide "Rating System → Information".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-information');
	//Hide "Rating System → Tools".
	remove_submenu_page('gd-rating-system-front', 'gd-rating-system-tools');
}

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

Where do I put this code?

How to Hide GD Rating System Meta Boxes

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

	//Hide the "GD Rating System" meta box.
	remove_meta_box('gdrts-metabox', $screen->id, 'normal');
	//Hide the "GD Rating System: Rich Snippets" meta box.
	remove_meta_box('gdrts-rich-snippets-metabox', $screen->id, 'normal');
}

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