How to manage categories?

[JustBlog]

Hi, is it possible for me to change the navigation menu bar tab into categories section?

When i create a new page, i will have a new navigation menu bar tab. Instead of a new page, can i have tabs named for example "Tutorial", "Articles", "Update" and when i click on example "Tutorial", all the posts that i put under Tutorial category will appear like in the main page. Same as Articles and Update tab.

Thanks.