Editing an announcement is just like editing a song or any other word processing file. The announcement Edit and Format menus contain many options to help change the contents of the message. You can also enter a unique title and/or comment that will be saved with the announcement.
If you want the announcement to be displayed in separate pages on the Projection display, use the Make line a header, or Insert header, options on the Edit menu. Any line that begins with a ¶ paragraph symbol will be used as a header, just as a song uses that symbol to mark the beginning of a verse. Similarly, any such line will be used as the title for that page on the playlist window.