Click the Log in/Create new account link in the horizontal navigation.
On the resulting page you will see a tab called Request new password. Click it.
On the next screen you will see a field called Username or e-mail address:
Enter the email address that you used to create your account.
Then click the E-mail new password link at the bottom of the form.
The system will send you a temporay login allowing you to change your password.
Please remember to update your profile when you do login.