The attached document explains how to locate research articles (of all types) in CINAHL. This database allows you to select "research article" in the advanced search options. For a review on how to distinguish primary and secondary research and locate research articles, you may review the online tutorial in the Nursing Research 39000 course library guide.
For your assignment you may need to find a primary research article or systematic review. Below are resources for you to use to locate systematic reviews, including the Joanna Briggs Institute and the Cochrane Library. If you are searching for research articles, you can search in the CINAHL database.