Images can be added to your posts using the “Featured Image” function. These images are used as the thumbnail image on your homepage and category pages, as well as in the header of your posts/pages. To add a featured image to your post, click the “Set featured image” link located within the“Featured Image” box when writing/editing your post. Upload a new image, or selected one from your media gallery and click the “Set Featured Image” button to set the image as your featured image.
Images with a width to height ratio of 4×3 are ideal. For example, an 800×600 image would fit perfectly into the post grid. Images that are of a different ration will be cropped to fit.