cannot use key code for item purchased in store

I bought Norton Security at a store to upgrade my old Norton expiring soon. However, there was no CD in the box, only a key code to use to activate the product. The problem is that everywhere on Norton's site there is no place to enter a key code for activation, unless you buy a product off their site. I DON'T Need another product, I have a new one! Over half of the links on Norton's site are broken, in that it sends you to a link to update or buy or enter your account information then crashes. I am going around in circles and not able to log in properly I had to create a new account, because it refused me. I am no dummy here, but this is the most unfriendly user site here. I have repeatedly followed the directions on line and gotten no where except Norton wants to sell me another product. I just want to use the product code that I have to down load my latest Norton product!!! This would have been finished already if I had the CD!