How to Hide Speed Optimizer Admin Menus

function plt_hide_sg_cachepress_menus() {
	//Hide "Settings → SG Plugins".
	remove_submenu_page('options-general.php', 'siteground_settings');

	//Hide "Speed Optimizer".
	remove_menu_page('sg-cachepress');
	//Hide "Speed Optimizer → Dashboard".
	remove_submenu_page('sg-cachepress', 'sg-cachepress');
	//Hide "Speed Optimizer → Caching".
	remove_submenu_page('sg-cachepress', 'sgo_caching');
	//Hide "Speed Optimizer → Environment".
	remove_submenu_page('sg-cachepress', 'sgo_environment');
	//Hide "Speed Optimizer → Frontend".
	remove_submenu_page('sg-cachepress', 'sgo_frontend');
	//Hide "Speed Optimizer → Media".
	remove_submenu_page('sg-cachepress', 'sgo_media');
	//Hide "Speed Optimizer → Site Performance".
	remove_submenu_page('sg-cachepress', 'sgo_analysis');
}

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

Where do I put this code?