After creating all the pages and modules (including sidebar), you have to create top navigation bar of the site.
Root
To add root, click on Add Root button, Property Editor Box will open.
Add caption of the root and select type.
Code
To refer home page select home and if you want to refer nothing, click on blank.
Page
To refer any page that is created. Select page from list.
You can redirect node to any heading of page also by Section field.
Module
TO refer any module. Select Module.
URL
To refer any external url. Enter url.
After enter details, click on Save.
The first node should be home Page node and refer to Type -> Code -> Home.
To add another root, click on Add Root. To add child to any node, click on that node and then Add Child. You can edit any node by click on that node -> Edit. You can delete node also.
You can create any tree like structure following parent-child relationship.