You need the full software version.
When you have this. You can then publish your files yourself as standalone Jpegs. As far as my understanding on the application is.. you'd have to email me all the pictures you've used in your pages as well as the actual pages themselves.
The trial version is just that, a trial without any real benefits to gain other than to test out the program and software.
For more info on this check out my how to on CBC here:
Comic Book Creator - How To