Hi, you probably are using the pro version. It’s a new installation or an old one? If it’s a new installation it would be better to use the free version with the new feed by mail module.
Anyway you should code your own theme and ignore that extra content (it has been removed on new version).
Let me know the version you’re running. If you want, using the free version with feed by mail module, a custom theme can have it’s own set of option. Of course if the extra content is one and you don’t need to change it, it would be simple to code it directly inside the theme.
Stefano.