Robbie,
Thanks for the compliments. I'm glad to hear things are going well for you so far. Now, let's get you going all the way.
If you're using Autotune, you should be able to update your settings in the FB App area. Even simpler, you should be able to click the "Refresh" button in the top right, which will detect the domain change and provide new recommendations. Then, just hit "Save Recommended Settings". After that, you should be able to update the Privacy Policy and hit "Save Custom Settings" to update any specific changes you may make.
If that doesn't work, let us know what error(s) you're seeing. Another option is to go to the
Facebook Developer Area
and update the settings there manually. It's a little more tedious and we don't have docs for how to do that since Autotune helps mask the constant changes that are made in the Developer Area. That may get you going quicker though if Autotune gives you issues.
I hope that helps, but should you need anything else, just let me know.
Thanks,
Alex