You've seen other people with the Xbox Box. Now you want one.
You can have one, so long as you have an active Xbox Live Account!

1

Open your web browser and go to http://www.xbox.com

2

Click on the Sign In button in the top right corner of the page

3

This will take you to the Sign In screen for My Xbox, as shown below.
From here click the Register Now button.

4

You have but to fill in the required information, and the Xbox Box will appear in your RvB profile!