I watched the video on creating custom specification documents here- http://www.justinmind.com/prototyper/...
But I don't see a "Reports" menu item in my version of Justinmind (5.6.1).
This video was recorded with a previous version of Prototyper, so things may have slightly changed.
In v5.6.1 it should be in File -> Export to Document -> Customized Document...
or pressing F6 in windows.
or in the toolbar, the 5th icon.
Here are two screenshots that should help:
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