How do I target news posts and articles by location type and role? 

Login to the admin.

Select an article or news post.

Scroll to the section titled 'Who can view this?'

For location type and role toggle between 'all' types or just 'some'.

If you select 'some' a list will be displayed and you and deselect the location types and or roles you don't want to be able to view the article or news post. 

Don't forget to tap 'Update' when you have finished editing.