1. Click this icon on the top right of the page:
2. Click Settings.
3. You can update your profile and your preferences on this page:
4. Click the Security tab on the left of the page to change your password:
5. Click the System tab on the left of the page to view and modify the rest of your settings:
Event security settings are also on this page (scroll down to see it). Here is a photo:
This page discusses event security settings in detail.