Paths are the way you structure and provide navigation to the project. Keep in mind that the home page must be the first page on the project's path. There can be multiple paths within a project.
To create a path, click the New page button (plus sign).
Select the Relationships tab and click the Path link.
Add pages you want to include in your path. Drop and drop these to move the order. Also consider what you want to happen when a reader gets to the end of the path and how you want to direct them.
In addition to paths, you can also create a table of contents. This can be found in the Dashboard. Clicking the wrench icon in the upper right corner of the page will bring you back to the dashboard. The Book properties tab will include the Table of Contents information.