Click on the frame that you want to create subpages.
Under Content Type, select Image if you want to have picture shows on the frame.
Click on Browser to select the image from your storage.(Make sure your image is fulfill the specifications)
Add More Image if you want to have slide effect from the selected frame.
Set the Interval time on the slide if your have more than one image on selected frame.
Select the action from Actiion Type.
Click on the SAVE button once you have done.