Articles are part of Journals.
Journals are found either by title or through Databases.
Databases are found by title or subject.
Library Subject Guides are a good place to start looking for information. Each of the over 80 guides lists resources that are the best for a given subject.
Databases A-Z list is good if you know the name of the database you want to use.
eJournals A-Z list is good if you want to jump directly into a journal you want to use. Especially good if you have a citation and are trying to find a specific, known article.
Library Search is a great place to start casting your net. Using the Library Search Box to look for books, articles, media, journals and databases from a single keyword search.
A keyword search will turn up two results screens. On the left side are books, ebooks, and archival material, and on the right side are a variety of subscription holdings, including journal articles.