Open iBA and your book.
Look at the screen and on the left is the verticle panel with your book pages visible. The panel header says BOOK To the left you see two horizontal lines.. they indicate you can move that panel...
Hover your cursor, left click to select and drag down to reveal your template default pages.
Its better to change things on the template and the resuts cascade through your book.
Object may have been locked and you cannot edit them. Selct the object, Go to ARRANGE, look for LOCK/UNLOCK and select Unlock - then open the inspector - second icone from the left select LAYOUT, at the bottom, you will see LAYOUT OBJECT... underneath is a check box Editable on pages using this object. Select it.