Double-click on the image box (or right-click and choose "Select Image")
The Image Gallery dialog box appears.
Click the "+ Upload Files" button.
A standard Mac or Windows file dialog appears. Locate a JPEG or PNG image on your computer and click the "Choose" or "Open" button.
The image will take a moment to upload into the Image Gallery.
Double-click on an image to insert it into the current Image box
Double-click on the image box.
The Image Gallery appears.
Locate the image in the Image Gallery and double click on it. This will insert the selected image into the image box.