Just go to the main page (http://www.deviantart.com) and look toward the right side of the screen, after the art pieces. You'll see the box that says "JOIN DEVIANTART NOW!" and an area to choose your username. Follow the steps from there, and viola!
Haha sorry about some people not being able to view the stories. Some of them are for more mature audiences (nothing hardcore though) so you have to be logged in and your privacy settings have to be adjusted properly to read them.