On my Mac, screenshots automatically are saved to the desktop. However, this very well could be different for you. To get to the Minecraft folder, go to finder, press alt, click library, then application support, then minecraft.
Also, just to let you know, this type of thread would be better suited for one of the support sections.
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My current avatar is: Raistlin Majere from the Dragonlance novels.
I am sure. when I use the search function all I find is the application and a few dowloads I have...like bukkit.Ill will try to find an appropriate forum. There is no minecraft folder in my application support. Nine folders, none of the minecraft. Most have to do with ilife appsI found it under my user name...then going to library..etc. Was looking on the hard drive directory. I thought everything would be on the hard drive directory.