PodTrapper can't get the feeds from Outlook.
If you're not familiar with podcast feeds, the easiest thing to do is use PT's built-in browser. You can access it from within PT by going to the "Main Screen", then Menu->"Add Podcasts"->"Browse/Search"
If you know the URL for the podcast feed, you can email it to your BB, copy the URL, and paste it into PT (Main Screen->Menu->Add Podcasts->Enter feed URL's manually
To download over USB, you need the Blackberry Desktop Manager installed (which I assume you already do), and PodTrapper's desktop downloader (available at
http://ota.versatilemonkey.com/podtrapper/). Enable PT to download over USB, and just plug in your BB to your computer. Make sure that "Mass Media" mode is OFF when you're attempting this.
For more information, please read the
manual and the
tutorial