Add a new scrapbook in the dashboard.

Then go to the page that has the nav bar and edit it, hover over where your nav bar is and then click on "copy to scrapbook" then add it to the new scrapbook you created in the dashboard.

Go to the other pages and add the navigation, but copy it from the scrapbook

Each page does not automatically have the navigation, you have to add it for every page.

However adding it to the scrapbook is a great advantage. If you change the nav bar on, for example the home page, changing something like the look and feel it will automatically propagate to all of the other pages where you copied the nav bar from the scrapbook.

Thanks for your help :)
so is this the best way to add navigation to all pages ? or there are other methods ?
I mean am I doing it right ?

This is the best way. Especially if you are going to use an add on like Ukao Menu (one of my favorites) to enhance the look of the nav.