You can subscribe to a page or item so that you are notified whenever that page or item is updated.
To complete this task, you must be logged on to the portal.
To
enable subscription to pages or items, the page group administrator
must have enabled approvals and notifications,
and the page or content manager (with the Manage
or Manage Content privilege on the page) must have included
the Subscribe link or icon on the page.
To receive subscription notifications, you must have access to a page that includes the My Notifications portlet. The My Notifications portlet must be set up to display subscription notifications. If you have at least the Customize Portlets (Add-Only) privilege on the page, you can add the My Notifications portlet yourself.
Go to the page to which you want to subscribe.
Click the Subscribe link.
Tip: The default label for the Subscribe link is Subscribe, however, the page designer may have given it a different label, or decided to use an icon instead. If you are not sure what to click to subscribe to the page, contact the page designer.
Now, you will be notified whenever the page is updated. Subscribing to a page automatically subscribes you to every item on that page.
Go to the page that contains the item to which you want to subscribe.
Click 
next to the item.
Now, you will be notified whenever the item is updated.