Setting up the mic for Mac Book

My sister in law and a friend were having trouble setting up the single audio input on the Mac Book to record some audio and couldn't figure out how to get the Mac to use it as an input jack instead of the speaker output. So for anyone else having the same problem, here are the directions:

Open the System Preferences panel -- the icon looks like this:Then in the Hardware section click on Sound (last icon on the right):


On this next screen choose the last option item "Input" (on the far right):



Then at the bottom of this screen select the dropdown for "Use audio port for" and select "Sound Input":


Your line in should now work....

Of course, once you're done you'll have to reset this to "Sound Output" again so that you can use speakers or headphones :-)