I am not a mac user, but I am quite avid on the Windows version. I'm not in front of my 2010 version at the moment, but I know there is a difference between an insert citation and an insert footnote. The shortcuts may have changed, but I think it's there on the ribbon still under references. You sound like you're trying to input footnotes, and not citations. I'd play with the ribbon there if I were you. Hopefully that helps.

Mark Gonda