Re: pdurrant
you really get me, it's not that simple to zip a folder into epub in Mac OS, which i am using, thanks! it does help!
Re: sherman
nvm, everyone ain't expert, but we get together, talk it over and learn from each other, right?

at least you know well on how you work with your Calibre, I meet another problem again in getting through Calibre.
How do I edit the "GUI" as I convert the ebook to epub?
What actually is GUI? I would refer to "graphical user interface"...but I don't know what it mean in Calibre.
getting to learn sigil too, it's mac enable, great!