Oh no, you've forgotten your password! That's ok, it happens to the best of us :)
Just click on the "Forgot Your Password" tab on the sign in page.
Enter the email address you used to sign up and we will send you an email to verify the address. Click the link in the email to recieve another email with a temporary password so you can log in.
Remember to change your password once you are logged in to something you can remember :)
Go to Setup > Account to change your password.