You may want to replace the automatically-generated Title Page. To do this:
- Go to the Organize page from your book's dashboard in Pressbooks
- Select Add Front Matter
- In the "Front Matter Type" menu, select Title Page from the dropdown menu
- Add your content (including images), and style it as you like.
If you want to take advantage of the Pressbooks Theme’s stylesheet for title page, then you will need to add the correct mark-up in the Text Editor, so that Pressbooks knows how to style your new Title Page. You can do this by using the following HTML in the TEXT Editor: