There are instructions on how to get started with Scratch here:
http://info.scratch.mit.edu/Support/Get_Started
If you get stuck with something, you can always ask for help in our All About Scratch forum here:
http://scratch.mit.edu/forums/viewforum.php?id=6
Also, if you already have Scratch installed, there's some good help pages right off the Help menu in the program. Good luck
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