Heck if I can figure that out, myself. It is supposed to self-populate when you add a title to the cover, but that didn't happen for me. Did you ever figure this out?
How do I add title to spine?
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Click on Covers in the very top left hand corner. You are now looking at your cover.
Double click on the spine itself to reveal a pop up box just like the one you use to add text on a page.
Type in your text.