What can I tell you, I don't really know how to expand on the title. I don't know how to remove a podcast feed.
I tried right clicking the podcast feed, when I do that it gives me two options:
- New Podcast Feed...
- Update All Podcasts
And none of the top menus have anything that suggests removal or deletion of a feed.
I'm astonished I can't figure this out.
Under Podcast within Rhythmbox highlight the one you want to remove and then move the mouse up to the top left hand menu. Under edit there should be delete
Just tested this and I can right click individual feeds and delete them also from the small right click menu that pops up