Find “Image Widget” widget and drag or put it under “3 Featured Images header“, add only 3 widgets, so it will look like this image bellow :
Upload the image content
After you add the widget, click the widget (click the triangle), upload Image (your image size has to be larger than 1024px width and 1024px height).
Fill in the following input boxes :
- Title = Title of your item/page you want to display
- Link = Link to the page/post
- Size = Choose Featured_square
- Align = Center
Repeat for the rest of other widgets.