A good place to start is the search box on the library's home page. Enter the big concepts of your search, trying to keep it to 2-3 word phrases, and then click Search.
Once the results come up, look under Source Type on the left and chose Articles. If you need peer-reviewed articles, look under Show Only and choose Scholarly/Peer-reviewed.
To get to the full text of an article, looks for links that say "full text available," "read online," or "get PDF."