The online builder allows you to add text anywhere in the book. To do so, you will need to activate the “Text” tab. If this tab is not already showing, click on the “Customize” button and the “Text” tab will appear. Click on the “Text” tab. You will then be able to drag and drop a text field anywhere into your book.
To modify the font/size/color/alignment etc., click on the text box and the text box menu will appear.
To insert text, just click on the text placeholder and start typing.