How do I add spine text to my hardcover book?

iOS:

You can add spine text on the Book View screen by tapping on the book spine or the settings menu.

Book Spine

Step 1:

Tap on Tap to add Spine Text to open the Project Settings screen.

Step 2:

Tap on Enter spine text , add the spine text you would like, and tap Done to save.

Settings Menu

Step 1:

Tap on ⚙ to open the Project Settings screen.

Step 2:

Tap on Enter spine text , add the spine text you would like, and tap Done to save.

Android:

After selecting a hardcover book, a dialog box will pop up prompting you to add text to the spine of your book. Simply add the text you wish and then tap Set Spine Text to continue to checkout. 

(Spine text is not available for softcover books.)