If a DOI or other identifier is included, you can click on it to find an online copy of the article. This may or may not be free to access, but will give you a place to start. If the article does not appear free to access, you may still be able to find the article elsewhere, whether online or through a nearby library. Consider the resources in the following points as further guides to accessing such articles.
Search for the article title on Google Scholar. If the initial result is behind a paywall, try clicking on the "All X versions" link - this will tell you if other databases include this article, and may help you find an open version. From here, you may be able to find additional sources on similar topics by clicking either the "Related Articles” or “Cited By” links appearing under most article’s link in the results. Articles found using these links and may provide you with information to expand your search.
Use OAIster or another open-access search engine to look for an open version of the article
Using either the DOI, Google Scholar, or the journal's website, find out what databases index the article in full text. You can then see if either your local library or TWL provides access to these databases.
Use WorldCat to see if your local library has a physical version of the journal
Request the article or the journal through your library's interlibrary loan service, if available