What Classroom in a Book did you purchase? What version of Premiere Elements is involved (also Windows or Mac)?
Did instructions come with the eBook files (Kindle Edition)?
Do you have instructions and are having problems following them and getting them to work as opposed to having no instructions for what you want to do?
You will need to get those files from the publisher (this is a user to user help site)
The printed CS5 Classroom in a Book that I have is from Peachpit publishing... but the website is www.adobepress.com
As per John T. Smith's questions, have you been to the your account at following seeking your practice files for the eBook
The generalized instructions that I see at PeachPit are
"Download the project files from eBook from the Lesson & Update tab on your Account page at www.peachpit.com
Please let us know the outcome.