For NewsBook, you can easily use a child theme to perform changes to the design / structure of the site without having to worry about future updates of the theme. In fact, we provide an easy to use starter kit.
Just download this child theme and install it on your server. Enable it instead of NewsBook and you have it up and running.
Changing the design / structure
All you have to do is to search the file you want to edit, and paste it in the exact same location in the child theme. Lets say you want to remove the author information on the post detail page. You will have to locate the correct file, in this case /templates/single-sidebar-left.php, and copy it from the parent theme to the child theme in the exact same location. Once you have done this, you can open the file in a text editor of your choice and remove line 8.
The same principle applies for everything from images, css styles up to even complex classes we use for our theme. You can change everything you want with a child theme.