Creating your account (for students under 9 I set this all up for them) is easy.  You do not have to down load anything for scratch to work but you need a scratch account.  To set up your account go to http://scratch.mit.edu and creative an account, ask your teacher first you may already have an account.

Having trouble or want to know more about your account watch the video:

Already a user of scratch then logon scratch.mit.edu