How do I add an ISBN to Calibre ebook?

Question

According to the Calibre 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:

• The ISBN box will have a red background if you enter an invalid ISBN. It will be green for valid ISBNs

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.

… 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?

Answer 1

The field for the ISBN is labeled "Ids:" and is located between "Tags" and "Dates". It allows you to enter ID types other than ISBNs.

Answer 2

There is also a plugin called Extract ISBN that scans the selected ebooks and, if it finds a valid ISBN code inside, updates the proper field automatically.