To get to your user settings click on your name in the upper right corner.
Under profile information you can edit your name and email, once you have made appropriate changes click Change profile details and all your changes will be saved.
Beneath your profile details you can choose the email notifications that you receive. Un-check the boxes for the emails you do not wish to receive, changes will automatically be saved.
At the bottom of your profile settings page is your activity feed, here will be your most recent updates about hand-ins and flags.