I jailbreaked my itouch. Everything thing works accept Installer. I have downloaded thems, but I have heard that you need something called Sumerboard to apply them. However, when I press Installer the page simply says Forbidden.
Forget Installer, that's a defunct app that really isn't used anymore. You should use Cydia or Icy to install apps on your JB iPod Touch. You also should download winterboard, not summerboard.
I'm guessing you're looking at some pretty old guides.