noob

So I tried to install styles first time in my life, followed the guides found on the web, but nothing. It doesn't work. Please help me out. Here are some screenshots: Thank you in advance.

I have been creeping this site lately in order to learn a bit about the Xenforo software. Looking to trade in my crappy WP+phpbb site for the real deal. Was looking at the top 3, and while vBulletin seemed to be more friendly, the hacking fiasco of last weekend made up my mind for me. Anyways...