Journal Articles
If you already have the bibliographic citation for an article, use the Journals search box on the library's home page to determine if and how the library provides access. This will tell you if the journal is available and allow you to "drill down" to the volume, issue, and page you need. Then just copy the link into Moodle.
If you are looking for articles on a subject or have just a title or an author, search in OneSource or in a discipline specific database.