Assign a Featured Image
To assign a Featured Image to a post, navigate to your post’s create/edit screen and look to the bottom-right. Here, you’ll see a box titled “Featured Image” where you can add your desired image. Be sure to update your post when you’re finished.
Once you’re finished preparing your post, you can click “Preview” to preview how your post will look once published onto your site, click “Publish” to have it appear on your site, or click “Save Draft” to save your post as it is, though not publish it yet.