Now that you have signed up, proceed back to the AWS home page and select the Sign in to the AWS Management Console link at the top of the screen.

If you have just signed in, your credentials will be already stored in a cookie locally in your browser, so you will be logged directly into the AWS Console.
The first time you log into the AWS Console, there will be a delay of around 20 seconds, depending on where you are located. During this time, your browser is downloading and caching the JavaScript required to run the AWS Console.
Initially, you will be presented with the following screen:

You will note that additional plugins may be required and that Amazon has very very nicely let you know that you do not currently have an Amazon S3 account!
The plugin that is required is Adobe Flash, so most likely you will already have this installed.
To use the AWS console and many other AWS services, you will need to sign up for Amazon S3 first. This is because many other AWS services use S3 to...