Where to place Code for Full Internet Protection?

I had an auto renewal in January, today had to reinstall Windows, downloaded AVG free, added the try it for free 30days of full Internet Protection, and cannot find where I can put my purchase code to make it so that I own it, not a trial anymore.  There used to be an "Activate" in the drop down boxes, but it is gone now or so well hidden I cannot find it.  

Hello Rebecca,
We regret for the inconvenience caused. You might have installed the AVG Free program with the Zen Interface and that's the reason you might have faced the issue. We kindly request you to follow the instructions on the article http://avgclick.me/UninstallAVGAV and once done please follow the instructions on the article http://avgclick.me/InstallAV to install the AVG Internet Security program.
Thank you.

Hello Rebecca,
We regret for the inconvenience caused. You might have installed the AVG Free program with the Zen Interface and that's the reason you might have faced the issue. We kindly request you to follow the instructions on the article http://avgclick.me/UninstallAVGAV and once done please follow the instructions on the article http://avgclick.me/InstallAV to install the AVG Internet Security program.
Thank you.