nobody knows what you want to accomplish based on your post above.
that page you showed is a separate thing from standard phpbb. you can download it from the link he gave you but you will be on your own to figure out if and how it may be of use to you.
from your question, I assume that what you want is just the basic way that phpbb does categories and forums etc. just like you have been doing all along.
however, what you asked and the image you showed don't reallly make any sense together.
I am available for custom work on a donation basis. Please send me a PM with your needs.
Premium phpBB 3.2 Styles
OK, so what's the speed of dark?