The Royal Society of Chemistry have a short PDF guide to reading journal articles, covering their structure and content, peer review, and reading critically. The guide is aimed at undergraduate students: you will find it useful if you are new to using journal articles in your studies.
A journal citation will look similar to this:
Sonnert, G. and Fox, M.F. (2012) 'Women, men, and academic performance in science and engineering: the gender difference in undergraduate grade point averages', Journal of Higher Education, 83(1), 73-101.
In this example the journal title is "Journal of Higher Education" and the title of the article is "Women, men, and academic performance in science and engineering: the gender difference in undergraduate grade point averages".
To find articles you must search Discovery. This will tell you if the journal is available either on paper in the library or online.