4
try the XOOPS FAQ section and do a search for templates...
Basically, you need to clone the default templates under Admin/Templates, then you can edit the cloned set.
The specific template you will need to edit would be the news page that you are talking about... if it's the page that displays a single article, you would need to edit the news_article.html template (or maybe news_item.html) in the cloned template set (Not the page with the same name in the news module directory)
Once you read up on it a bit you will see that the template features make it easy to customize your site without messing anything up.
By the way, you shouldn't need to add self, just remove _blank.. self is default if nothing is specified (but you can add it if you want)