You can find what database a journal, magazine, or newspaper (all periodicals) is listed in by searching in the Discovery catalog from the library homepage:
Once you find the journal, click on the title (sometimes placing the title in quotation marks will give you different results, causing the catalog to search for it as a phrase):
You can either select the blue button for the default database called "Access Journal" or scroll down to "Access Options" to see all the databases (sometimes there is more than one!) which hold the periodical and the years of coverage is has access to (coverage can differ, depending on the agreement the publisher has with the database):
Clicking on the default access button will take you to here, where you can use the "search within this publication" feature to search within this specific journal for your topic to find an article:
Here is an example search that gets results to articles within that specific periodical:
If you still have questions, feel free to reach out!