Oh thank god, its not just me.
I have been strugling with this for DAYS now.
The Profinet(m) menu item is shown, but it does nothing.
Apparently there should be a piece of software called pfn-ct that can do the setup from a pc, if you are connected to the profinet side.
Im still trying to get a hold on this software, Not to mention a newer version of the profibus manual that contains appendix D, that shows more about the molex cards.