Podcast list management (remove, better edit and better rename)

I can't find a way to remove items from the podcast list. If this feature is not implemented, it would be good to have one. If it is already implemented but not so visible, making it more visible would be a good idea!
It is also not possible to edit the url of podcasts already in.
For the already existing podcast rename and for the proposed (2) podcast url editing it would be better to have the previous name as the initial pre-filled value instead of blank as default.

The non existence of 1 and 2 combined led to url garbage accumulation - if you type a wrong url there is no way to take it out.