Click on the first ball with a "lock" on it. (If signed in, sign out and start over.)
Click the "SIGN UP" ball.
Select the form based option.
Fill out all the fields and click "Register".
Check your Email
Check your email to confirm the account and set a new password.
Click on the link within the body of the email
Set your password and click "Confirm".
After clicking "Confirm" the page will reload and you're now signed into the Galaxy. Access to other applications is not available until requested and granted.