You may want to explain articles that you read in magazines, newspapers, and on the Internet.
When you just want to tell someone the topic of the article, you can say it like this:
I just read an article about the upcoming U.S. election.
But if you want to explain what the article is saying about the topic, you use "about how" followed by a complete sentence:
I just read an article about how people are using a betting market to try to predict the upcoming U.S. election.