First, you will want to locate your Newsfeed and find the tab that says SOURCES.

This will bring you to a new window that will show you a list of filter options. 

After you choose what you would like to be notified about, you will want to be sure your desktop notifications are on. Every time something regarding a Press Release or SEC Filing, you will be the first to know about it. You can chose to put any number of these sources on at one time.