To add a title to your Classic Chatbook, from the iOS app, follow these steps:
Tap the My Book' tab and tap into your Classic book Draft.
Tap on the Cover of your Book.
Tap Title Layout.
Select which Title Layout you like best for your front cover.
Once you find the Layout you prefer, tap "Done" to keep your changes.
Here's a short how-to on showing you how to edit this in the Chatbooks' iOS app as well:
iOS