If you get "Unrecognized username or password" when you try to log in, you can get a one-time login link mailed to you by visiting the request new password page (image). Here you can enter your email address. It will send you an email with a link that you can click on to log in - and then change your password (image).
This one-time login link may land in your spam folder, so look there. And please add firstname.lastname@example.org to your "Approved senders" list or your address book to prevent that from happening.