You are able to make changes to the site and view those changes without changing your live website. Here is how you would preview the site with out making the changes live:
1. Select Content
2. Alter your content or design as you desire
3. Open a new browser Tab (on a mac you can press command + t)
4. Type in the url: https://design.livebooks.com/preview
5. View the changes that have been made without it being on the live website
6. Select Publish when you are happy with your Preview settings
Feel free to let us know if you have any other questions!