Podcast Picture... how to change it

I'm confused.
I updated my podcast this evening, and went to submit it to iTunes (which I've never done before) but the picture the "submit" box is giving me is for an old podcast which isn't there anymore, and it's ignoring the graphic I have dragged into the picture box for the new podcast. I have no idea where it's getting the picture from that it is, since that's no longer on any page. Any idea how to fix this? I'm using the most recent version of iWeb and I'm not a .mac member.

Thanks!