How to Hide the "AR Reg Secure" Admin Menu

function plt_hide_ar_registration_secure_spam_blocker_menus() {
	//Hide the "AR Reg Secure" menu.
	remove_menu_page('ar_reg_secure_settings');
}

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

Where do I put this code?