what settings will "stick" the group footer to the bottom of a form?  I find that it spaces itself below the last detail line.  I want it tied to the bottom. Is it in bottom offset, dynamic heighth, print position?  A little tutorial would help in using the editor.

I agree also!!!  I was trying to use it yesterday but gave up in frustration.  It's a great tool... now if I could just use it.  

Any progress on this request?

To answer the original question, the way I have mine set is Dynamic Height, and then under Position I specified the Height & Print Position. I know I had to play with it a while to find what worked, but it does.
 
Note that you will probably have to plan on using the margins of your most restrictive printer - for instance, just because your dot matrix printer can print 0" from the bottom, you have to account that someone may print it from an inkjet that has a 5/8" bottom margin.
 
My Invoice is set to Height of 1.1563, Print Position of 9.5936", and Bottom Offset of 0. I never figured out what bottom offset did, leaving well enough alone.

I will move this to the top of the list for an online flash tutorial.