For the "Genre Analysis" you are asked to select a topic that interests you, collect three examples of the op-ed genre on this topic, and be sure to select editorials from three different publications.
Two great places to start searching for editorials, opinion pieces and "viewpoint essays" are the Opposing Viewpoints database and the US Major Dailies database, both available here:
Below is a video showing how to access and search the Opposing Viewpoints database.
In addition -- in the boxes below, you will find direct links to additional sources which are easy to browse. Since some of the sources require a subscription, the second link (if needed) will provide you access to additional articles through the Pace Library databases.
At the bottom of the page is a video explaining how to search the publication pages.
Starting at 33 seconds, this video will explain how to search for specific articles in publications using the Pace databases. (Most relevant information ends around 6 minutes).