Journals, magazines, and newspapers subscribed to by the University Libraries can be in many different locations / formats. To figure out where they are, search Discover Local (the catalog), or if you are in a database, see if there is a link called "Check for Full Text" available. (Sometimes the link is accompanied by the logo.)
If you find a citation to a journal article in a bibliography or get a recommendation of a journal title from a professor, and aren't sure where to find it, go to Discover Local, the library's catalog, and do a search for the journal title.
The example below demonstrates how to find the journal American Historical Review.
When you click "Online access" you'll see something like this:
Every database is different, but the next screen will probably allow you to choose the year you need. If the issues aren't listed on that page, look for words like "archive" or "issues" or "back issues" to get to the year you need.