Dr. McVerry created a tutorial on how to make images on my homepage take the circle shape. In order for this to happen, the original image needed to be square. To do that, I uploaded the image to my iPhone. From there I opened photos and found the image. I tapped the edit button->crop, and used the feature that converts the picture into a square image. (see figures below).
Tap the square button shown in the yellow circle.
I saved the revised picture. Then uploaded it into my media file and followed the instructions in the video.