Is there a way to delete or edit the existing Internet Radio bookmarks that come with the Media Player?

The menu only has the option to "add" bookmarks.

I tried editing the file /usr/share/pre-installed/mafw-iradio-source-bookmarks/bookmarks.xml to remove the unwanted bookmarks,..
I also tried deleting this file,..however the bookmarks still appear when I fire up the Internet Radio.

Thanks