how to use headphone jack as audio input
I just bought a 13" Macbook Air. I can not seem to find the setting to use my headphone jack as an audio input. How do I get audio in to record with Quick Time and Garage band?? I am using a sound board that works fine with my 13" Macbook Pro. I do sound for a christian band and they like to relisten to make changes to the songs and sermon.
MacBook Air (13-inch Mid 2013), OS X Mountain Lion (10.8.4)