To use Amazon S3, you need an AWS account. If you don't already have one, you'll be prompted to create one when you sign up for Amazon S3. You will not be charged for Amazon S3 until you use it.
To sign up for Amazon S3
Go to http://aws.amazon.com/s3 and click Sign Up.
Follow the on-screen instructions.
AWS will notify you by email when your account is active and available for you to use.