There are 2 types of news articles: Announcements and Media Articles. Although similar there are some technical differences with how the pages are handled:
A News page is an announcement created by UCLA (either from the UCLA Newsroom, or directly from a Semel Program/Center/Service - you). If the announcement is posted to the 'Semel Institute' audience (under Groups), and is 'Public,' the announcement will also appear on the front page of the Institute website (so please exercise discretion when selecting this option).
This is quite a basic page - a title and body - but can also be useful for internal admin announcements if you deselect the 'Public' checkbox under 'Groups'. If you are announcing an event, it may be simpler just to create a new 'Event', as that should appear somewhere prominent on your site.
A media article or feature (eg, news cutting) - you must be able to provide a URL (web address) for the original article to create such a page. It may be useful to provide some 'Teaser' text, describing why it is relevant to your group and to UCLA. Many news agencies will only leave news articles on their websites for finite periods of time, so don't dig out articles from several years ago to make your list bigger; it does not give your site visitors the impression that you are doing much current activity.
By default, all the most recent Media features will also appear on the Semel Institute news page www.semel.ucla.edu/news  under 'In the news.'