I got a new flashgun and thought it will be easy to use, but it's not. As the flashgun is Conon's speedlite 580 II, it doesn't work completely automatically on my OlympusE-400. Could someone help me? Where could I find the basics of how to use it? (I have the manual, but I still don't get it...) I was planning to volunteer as a photographer for my son's school, but I would definetly need the flash for indoor pictures... Thanks for help!