We always want to lead off our posts with a big photo.
Click on Add Media (under the Title) > Upload > Select Files, and upload best photo from your set.
Or, to ensure that you have complete control over the photo, you can use the Insert from URL feature.
Don’t forget to fill out the Title, Alt Text, and Description fields (bottom right) so Google Images will find your photo. You can also add a caption with your copyright.
Set the Alignment to Center, and set the size to Large (680px wide) so that the photo fills the whole page.
When you’re done, click Insert into Page and your photo will be added to the top of your post.