How to Hide the "Akamai mPulse" Admin Menu

function plt_hide_mpulse_real_user_measurement_menus() {
	//Hide the "Settings → Akamai mPulse" menu.
	remove_submenu_page('options-general.php', 'mpulse_plugin_page');
}

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

Where do I put this code?