There are several places where you can find out how many times an article has been cited by other scholars:

Option 1: Scopus

Navigate to Scopus, which can be found under "S" in "Find a Database". From here all you need to do is search for the article in which you are interested. To the right of the search results, you can see the number of times the article has been cited. You can also analyze whole journals by clicking on the "Analyze Journal" link above the search box and searching for a journal.

Option 2: Google Scholar

Navigate to Google Scholar, which can be found under "G" in "Find a Database". Here you simply search for the article in which you are interested. Under the link, you can see the number of times the article has been cited.

Option 3: Web of Science

Navigate to Web of Science, which can be found under "W" in "Find a Database". Search for the article in which you are interested, and the number of citations can be found to the right of the search results. Also, when you click on the hyperlinked title, the number of citations can be found to the right under Citation Network.

Please keep in mind that these methods may not produce a complete list of all times an article is cited because each searches different databases and sources.