[twistsol]

From your news page, turn on the site editor and create a new page. for the url of the new page, use "articles/newpage" where newpage is whatever you want your URL to be. Then use that as the URL in the navigation editor. By using the articles/ and adding the new page then the articles tab which you called News on the navigation bar will be highlighted when you select your your sub page. if you take a look at our site http://www.sawdustzone.org, ours our set up as Articles at the top section with half a dozen sub pages for different categories.

You could also try changing the URL on the articles page to be news, then you would use news/newpage as your URL, But I've never done that and I honestly don't know if it will blow up or not. So take a backup of your database first.