Question

how can i register?

Answer 1

Are you talking about registering for this open study? If so, I believe you are registered since you have posted here. If you are referring to something else you should specify what you mean.

Answer 2

If you want to register for the Intro to Computer Science class you will need to sign up on edx.org, or just begin the self study on the ocw.mit.edu

Answer 3

http://ocw.nd.edu/computer-applications/applied-multimedia is another link you may register with as well.