adding recipients

You mean adding notifications when someone subscribes?

For the moment this is available only in the pro version. I’ll consider adding it here too in some next update

I’m not quite sure what you mean by adding form code?
Maybe you’d better play with the demo at http://calendarscripts.info/bft-pro/demo.html

Um no, why do you need this? There is a setting to each mailing list that lets you define who will be notified about the registration.

Go to mailing lists, then Edit, then you’ll see it in the form

Well, that’s what I told several messages above. It’s currently only available in pro. In some future update of the free one it may be added there too.

This is now done in 1.9. In the main settings page you can select to be notified when someone subscribes/unsubscribes.