In order subscribe to the weekly Project Moonbase podcast, you just need to add this URL to whatever you use to subscribe to audio podcasts:
http://feeds.feedburner.com/blogspot/pmb
In the case of iTunes, here's a step by step guide:
1. Copy the above URL to your clipboard.
2. Open iTunes and go to Advanced > Subscribe to Podcast:
3. Paste the URL you copied above into the pop-up window which opens:
4. Click OK.
5. If you now go to the Podcasts view in iTunes, you'll see Project Moonbase is now in the list:
iTunes will now check once a day (or however frequently you set it to) for new editions of the podcast.