To add products to the recommended section in the top menu, select Catalog / Featured Products /
These products are displayed on the main page of your online store in the "Recommended"
To add to the "Recommended" section one more product - click the "new product" button. You will see the following page:
You can select the desired product from the drop-down list and specify the date after which the product will leave the category "Recommended." Now the section on the main page looks like this: