The Configure News Reader Widget configuration overlay contains the following:

Properties Toolbox
•News Feed: a dropdown field, which lists a set of marketing news RSS feeds. It defaults to the Redpoint Global Blog.
•Use custom news feed URL: this checkbox, displayed within the Advanced section, is unchecked by default. When checked, the Custom Feed URL property is shown, and the following read-only text is displayed at News Feed:

•Custom Feed URL: displayed when Use custom news feed URL is checked, this property initially displays the URL of the selected news feed. You can use the property to specify a URL that returns a valid RSS feed.
Preview
A preview of the specified new feed is shown to the right. Having changed the widgets settings, click Refresh to update the preview.