using external libraries with Xcode 4.6.2

I am taking the CS106B(stanford) course online named programming abstractions, I installed the libraries from the course web page:
but I don't know where they go after I installed them, or how to include them in a new project.
I also need help in order to add a new .cpp file in a project, There is only C++ classes in Xcode, when I choose a C++ class I get 2 files a .cpp and a .h, is that ok?.

Please excuse my English!! I am from Lima Peru.
Thanks in advance for your answers.

Willy Görbitz

P.D. I'm using an iMac with OSX 10.7.5

Topic archived. No new replies allowed.