Click icon to save the current page list and basic information (magazine name, pakage prefix, package name, save path, etc) as xml file for future quick loading and continueing editing.
Click icon to the xml which store the basic information saved just now to continue editing.
Click "File--> Export project" (top menu line) to export the current editing project as package project file for transmitting among friends or future edit.
Click "File--> Import project" (similarly on the top menu line) to import package file exported last time to continue editing.