Follow the steps that will get you familiar with the development environment and project properties. When you finish exploring, click "Sign Up" at the title bar to move on.
If you typed in your own credentials, you will receive an email with an activation link. Just click on the "Confirm Account" button.
If you chose to sign up with Google or Github, you may need to login and authorize codebender.
After sign up, you will be redirected to your homepage. A message will appear to inform you that you will have to follow the Getting Started Guide. Just click on the "Let's Go!" button.