Problem with Bootstrap

[eluser]Unknown[/eluser]
Hello everybody. I'm new at CI. If it's not hard for you, please help me to deal with Bootstrap...I followed the Bootstrap's tutorial...did exactly the same they ask to do .....changed roots to files hundreds time, but it still doesn't want to work. Maybe somebody had the same problem? Please help because i don't know what i did wrong.
P.S. sorry for my English.