In order to manage your web site pages you need to navigate to the CMS section under the Magento admin area.
Click on the Manage Pages link in order to proceed with the pages’ modification:
You can edit a page by clicking on it. The Edit Page will open:
and modify it to your preference.
Static blocks is another useful option. For example, you can edit the footer block which contains the links located at the bottom of your main page:
The Polls section allows you to create and edit polls: