Replacing the "f" icon in the gnome menu bar

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http://forums.fedoraforum.org – Hello, I would like to replace the "f" icon in the top left menu bar in gnome. I've understood the icon is named start-here.png and I replaced it by my own icon in every folder I've found it. And I rebooted the system. But I still have the "f" icon in the menu bar. Has someone successfully replaced this icon and how to do it ? Thanks (HowTos)