How to renew with a product key?

My subscription will expire in a few days. I have bought a product key. Where do I need to enter it to renew?

 

Activate your Norton protection with a product key ›

  1. Open your Norton device security.
    If you see the My Norton window, next to Device Security, click Open.

  2. In the Norton product main window, click Help > Account Information > Enter Product Key.

  3. Enter the product key that you received from Norton.

  4. Click Next and follow the on-screen instructions.

 

https://support.norton.com/sp/en/us/home/current/solutions/v24808774

Norton 360 Classic view -> Help -> Help Center -> Enter Product Key


Note: New product key starts New subscription term. 
Wait till ~last day to enter new key or Contact Norton Support...request new key term added to current subscription term.