Select the post you would like to like add an image to
Click on the Add an Image button next to Upload/Insert
Click the select files button
Choose the desired file(s), to select more than one at a time hold down your control/open apple key and click on additional files
Choose alignment and desired size.
Click Insert into post
Upon completion select the blue update button on the right.
If you add multiple photos to a testimonial/post the first photo will be the only one that will display in the post. If you click to view that post on its own page it will show all photos that have been uploaded.
Upload all images as thumbnails. Formatting has been put in place to avoid distorting the images.