i signed up for November 3rd only in the mid-September and received my confirmation letter within 2 weeks... you should call them and ask where your confirmation letter is. I actually wrote down the phone number in case I don't receive within 3 weeks, so if you don't have this number, you can definitely try and call them at: 1-866-473-4373.
Also, in my confirmation letter it's said that if you want to add a score recipient, then you should go to http://www.ets.org/gre/stupubs.html
and enter there the institution's code number.
Have you started studying already? I did some review over the summer, but now I don't even know what's the best way to study since my only free time is pretty much on the weekends.