To fix the first problem, I used the feedburner URL in itunes and then entered the same one in the podpress plugin. It works fine. Unfortunately the podcast feed widget that comes with podpress does not, because it’s till pointing to a different url. Don’t know how to change that.
2)I went into the code and made the change from /feed/rss2 to /?feed=rss. I did that once before, but apparently didn’t wait long enough for it to take. Not sure why I needed to make the change, because from what I’ve read, both ways should get me to the feed.
3)This was a bonehead mistake on my part. I attempted again and was able to create a second feed. The fact that it had discovered a feed already has nothing to do with it. I think the reason I got thrown was that it kept taking the name of my entire blog.