Connect CI 2 to Garage Band

Can anyone help me with my issue?

I would like to connect my CI2 to Garagband 11- but its not working.

I have the Mac OS X Version 10.7.2
Processor 2.8 Ghz Intel Core i7
So, the latest MacBook Pro.

I must say that i also installed the Cubase AI5 which came along with the CI2 steinberg and tried to connect the interface to the CUBASE but it didn’t recognize the CI 2 either.

So i might be doing something wrong in general.

Anybody knows what i can do?

Thanks so much!