On your preferences page you can control what emails are sent you when various actions occur, choose what widgets are shown on your profile, manage your preference to an officially provided image (if configured) as well as manage the Twitter integration for your status updates.
You can disable the Twitter integration by clicking Unlink.
If available, you can check the checkbox to use the official institutional profile image in place of any one you might have set yourself. You can disable this at any time and your profile will revert to the image you had set previously.
If available, you can choose what widgets appear on your profile. Hover over the icon for more information about each widget.
When you are finished, click Save settings.