To swap images between frames, click on "Edit Page" across the top and make sure you are on the correct page.
Then click on the image frame containing the image you want to be moved. Once the image frame is active, a gray box will appear at the top left. Click the gray box and drag to the destination frame. The image being dragged will turn transparent. Release the mouse button over the destination frame and both images will swap.
If you have any further questions, please email email@example.com