Access the computer library folder rather than the user library folder with Terminal

I am trying to chmod a folder in the library of my mac but i can only get to the folders below the user level.

Does anyone know what I need to do?

I need:
Library/WebServer/Documents/... etc

I can only get:
user/me/... etc

cd /Library/...
Notice the beginning / ?
What file do you need to chmod? You sure you know what you're doing?