Stylesheets

Another week and I still can't get my stylesheet to work. I'm really close to just giving up. It publishes, but it doesn't DO anything! No one else seems to be having this problem, either, and I can't figure out what I'm doing wrong. I left a note on the page I was supposed to format saying I followed the directions to a T and nothing will make it work. If I can't get it figured out after the chat, then I give up.