Go to "Pages" on your admin side menu.
Click on "Home".
Make sure you are under the "Editor" tab at the top (see screenshot below).
Scroll to the Featured article section.
Hover over it and you will notice that it turns blue and says ‘Edit’ (see screenshot below).
When you click on it, the "Featured Content" tool opens up. You should see a fillable field -- this is a search field that allows you to enter terms to find articles that you want to place in this spot. You can also paste in URLs of Resources on your site and that will place that article in this spot.
Hit Save, then click the Update button to save the changes to your home page.