Art Explosion Publisher Pro is a product released by the NovaDevelopment website. It's widely known that their products don't have public support. This means you will actually have to consult the built-in Help section to look for printing features and information.
Additionally, look in the installation folder as well for user guides and resources that might help you to better understanding how printing and customization works.
If you can't find the answer, then contact the developers using the following link: http://www.novadevelopment.com/support/customer_service/index.html