Hi again Emma
I had another look at your publication because I noticed you used a speech bubble jpg rather than an easy to draw vector graphic.
Opus has some great autoshape drawing tools and one of the autoshapes is almost exactly the same as your jpg graphic. The big advantage of using an autoshape is that you wouldn't have a white box 'stuck on' effect around your speech bubble as you currently have.
Once you draw your autoshape, you can overlay the autoshape with a text input box and select the properties of the input box to remove the automatic border and the grey shadow outline.
Voila!
You have a natural looking text bubble.
Just be sure you don't confuse the drawing tools with hotspot tools. They look the same but have very different purposes and uses.
The other thing I noticed is that your chapter 2, page 1 page size is the same as the text input page size. If you want printing at the top, you can change the Chapter 2, Page 1 page size through the chapter properties feature.
I changed your print page size to 300 by 500 as an example.
Cheers
Graham