These feeds are settings that tell PowerPress to add podcasting support (or not). There are three choices:
Enhance All Feeds (recommended). This setting adds podcasting support to all feeds. It allows for category podcasting (visitors can subscribe to your categories as a podcast)
and allows for tag/keyword casting (visitors can subscribe to your tags as a podcast).
Enhance Main Feed Only. This feed adds podcasting support to your main (WordPress-generated) feed only.
Do Not Enhance Feeds. Feed settings below will only apply to your podcast feed.
The Podcast Only Feed (or feeds if you are using channels discussed here) give you a link to validate your feed at FeedValidator.org.
Note, unless it says “Sorry, your feed does not validate” at feedvalidator.org, you should be OK. Any messages you see after it says “Congratulations! This is a valid RSS feed”, are suggestions and shouldn’t have an effect on your podcast feed. Most of them should be fixed but the RawVoice namespace is OK. It’s just that Feedvalidator does not know about the namespace for RawVoice. (as of March 2013).
Feed Discovery (default off)
This puts a feed discovery line in your HTML page headers so Web browsers and feed readers can detect your podcast feed.
Show the most recent ____ Episodes/posts per feed
If you leave this blank, it will use the default you have set in your WordPress settings / reading tab (normally 15). This will be the number of episodes in your feed that will show up in places such as iTunes and other directories. You should be able to safely post 50 or so. Any more than that, you run the risk of your feed becoming too large for directories to pull. 512k is normally the max size for feeds used in this way.
RSS2 Image This is where you would upload or give the URL to your RSS image (feed image). There is a setting in the iTunes tab for your cover art. That image can also be set to act as your RSS2 image.
Feed Language Unless you have a good reason, leave this one set to blog default. Otherwise, there is a long list of languages you can choose from.
Copyright The area for text about your copyright. Normally a year or within that range.
Basic Show Information
Location – Where is the show produced?
Episode Frequency – How often do you produce a show?