Do you want to change the path (in the explorer Addressbar) or just the name 'News' as shown in your site? If it's the last:
Go to your-url.com/news/index.php/news_admin (if you didn't change that name during setup). Login with your user name and password.
'News' is the title of the rootfolder for this site: You'll probably see it in the first screen that appears (if not: go to Content). Click Edit to change the title to Forsiden.
