How do I register? What should I do if I lost my invitation?

How can I update my user account information? My email address has changed. How can I update it? How can I update my photo? Can I configure the notification emails I receive ? How do II set my language preferences? Can I save my search criteria for future use? What if my user account is locked? Why is my password not allowed ? Why do I need to change my password? I have forgotten or lost my password I have forgotten or lost my username I asked for my username to be resent but I did not receive the expected email I asked to reset my password but I did not receive the corresponding email. How can I recover my username or password? How can I change my password? How can I close my account? Can I stop using SY?