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I downloaded Calibre two days ago. According to the Calibre user manual (website):

Click the book you want to edit and then click the Edit metadata button or press the E key. A dialog opens that allows you to edit all aspects of the metadata. It has various features to make editing faster and more efficient. A list of the commonly used tips:

I see no ISBN box, red, green or otherwise in the edit metadata dialogue. On another Calibre page I see:

you might want to display the ISBN, a field that calibre does not display. - http://manual.calibre-ebook.com/template_lang.html

...followed by something about "simply hover your mouse over the column header" in the Calibre template language, which I cannot find.

So, how do I add an ISBN (which I have) to the publication I need to convert to ebook?

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up vote 1 down vote accepted

Click the button next to "Ids" in the middle column of the "Edit Metadata" dialog:

enter image description here

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