Help! I am having issues updating my antivirus...

So, I bought an HP laptop at the end of november. When i bought it, I purchased 15 months of usage with Norton. I decided to use up my 60 day trial before entering in the code that was sent with my laptop to use the 15 months. Well my 60 days is up in 7 days. I can't find anywhere to enter in a code. All its allowing me to do is purchase it. I've already done that though. Can anyone help me with this?!?! I don't want to get to the end of the 7 days and then have my computer not protected. I'm a student so I have extremely important stuff on here. 

 

All I received with my laptop was a sheet of paper that confirmed my purchase of norton for 15 months and then it has a code on there to go online and enter it. Where?!