How do I delete<home directory>/Library/Preferences/Macromedia/Flash\Player?
iMac, Mac OS X (10.6.8)
Choose Go to Folder from the Finder's Go menu, paste in ~/Library/Preferences/, and delete the Macromedia Flash Player folder.
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Note that it'll be created over every time you load a Flash object in a Web browser (at least if it has Flash enabled).
The only way to consistently get rid of all its content would be to create an AppleScript, or use Automator to create a workflow that would empty this folder when you close the browser.
How do I delete /Library/Preferences/Macromedia/Flash\Player ?
