How to Hide Video Reviews Admin Menus

function plt_hide_video_reviews_menus() {
	//Hide "Video Reviews".
	remove_menu_page('video-reviews');
	//Hide "Video Reviews → Video Reviews".
	remove_submenu_page('video-reviews', 'video-reviews');
	//Hide "Video Reviews → Affiliation".
	remove_submenu_page('video-reviews', 'video-reviews-affiliation');
	//Hide "Video Reviews → Contact Us".
	remove_submenu_page('video-reviews', 'video-reviews-contact');
	//Hide "Video Reviews → Support Forum".
	remove_submenu_page('video-reviews', 'video-reviews-wp-support-forum');
	//Hide "Video Reviews → Upgrade".
	remove_submenu_page('video-reviews', 'video-reviews-pricing');
}

add_action('admin_menu', 'plt_hide_video_reviews_menus', 1000000000);
Where do I put this code?