Maybe it's an obvious question, but did you check out the Kobo forum?
This was posted there about 6 hours before you posted here.
Quote:
Originally Posted by Quexos
I don't like Calibre much. It's a bit confusing, at least for me it is. Instead I go to the codes and tweak here and there manually. Most formatting issues can be fixed straight in the .css file. 
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What does this have to do with anything? Calibre is not an editor. It's a book manager/database with conversion functionality. If you're editing a book, use a tool designed for editing a book, like Sigil. But that's completely unrelated to klausy's issue.