How would I have got blog and news pages to list articles/blogposts, how do I edit?
In Drupal 7, go to /admin/structure/menu/manage/ to manage your menus. Select "Main Menu" as that will probably be your primary navigation.

Click +Add Link. For both Blog and News, set the appropriate name in the "Title" field.

For path, set the Blog path to "blog" or for News you can set it to "home" to retrieve articles promoted to the front page, or something like "news" if you have a specific page with a path set to that for those articles to be displayed on.