Norton.com/Setup

The process starts by purchasing a Norton subscription, either online or from a retail store. If you’ve purchased it from a store, you’ll receive a product key that will be necessary for activation. For online purchases, the product key is usually sent to your registered email address. Once you have your key, follow these steps to get your Norton antivirus up and running:

Source: https://sites.google.com/view/nortonusa/home