If you are migrating from another application to MediaMonkey, you probably have numerous podcasts that you'd like to manage with MediaMonkey. To do so:
1) Note the Podcast directory at Tools > Options > Podcasts, and either:
o Change it to the directory in which your podcasts are currently stored
o Move your podcasts to that directory
2) Click File > Add / Rescan tracks to the library and scan the podcasts folder
3) Your podcasts will be added to the library, and appear in the 'Podcasts' node, however, any podcasts that don't have an associated subscription URL will be greyed out. You can right click on the Podcast node and select Properties to to add the subscription url to the Podcast's properties.
If you have an OPML file from another Podcatcher application, you can add it to MediaMonkey via Edit > Podcasts > Add Directory (OPML). You can then subscribe to each of the podcasts in the directory.