If you can't login, check to make sure that your "caps lock" key is off. Your username and password are CaSe SeNsItIvE. If you still cannot login, you can request to reset your password or contact Client Assistance.
To update your profile, you must visit the Edit Profile page. You can move through the different parts of your profile by clicking the tabs at the top of the page.
If someone is bothering or harassing you, blocking them is usually the best solution. Visit the Account Settings page to learn how to block people. If someone continues to harass you despite your efforts, you can report it by contacting Client Assistance.