Trouble with converting trial to full subscription for Norton Internet Security

Hi I had trialed the NIS product.  Then the subscription was close to running out, so I bought a full year's subscription a few days ago.  However, my system is showing only 5 days left on my trial and I am getting annoying messages to renew.  I can't figure out how to get my software to give me a place to put in my product key for the year's subscription.  Is there someone from Norton support who can help?