Clicking the "Update Account" link in the menu will take you to the Update Account page.
On the Update Account page, you can update your Username, First Name, Last Name, Email, and "Include your user name in User Search lists" status.
After you click the "Submit Changes" button, you will get a message that your user account has been updated, and that you have been logged out of your account.
You will then be able to login with your account, by clicking the "click here to login" link on the Update Account Confirmation page, or the Login button in the menu.