In order to subscribe to an iTunes podcast you should first load iTunes onto your computer and spend a little time becoming familiar with the iTunes store. You can download the software from this Apple web page.
Then return to this page to click on the 'Subscribe' link below. It will take you to the home page for this podcast in the iTunes store.
Of course you don't need iTunes to watch the videos online. Just click on the Windows Media Player links that you find on the tour pages.
If you already have iTunes
simply click below.