Thanks for writing us. If you have 10.6.8, I think that Mac OS X Snow Leopard: The Missing Manual will work better for you, so I've added that ebook to your account. You can download it from Your Products.
It looks like you should see Show Package Contents when right-clicking Applications in Snow Leopard or Lion, but the section you were working through is specific to Lion.
I hope that the Snow Leopard book will help.