I think Dive posted decent instructions on the KK thread. Just enter the three letter code in the upper right hand corner. You will then need to wait like 30 seconds (there will be a count down). An ad may pop up. If there is a box in the upper right hand corner that says "SKIP THIS AD" click it. Otherwise, you may have to close the pop up window. After the 30 seconds are up, there will be a green box that says "download" or something like that. The file will saved as a zip file so you will have to unstuff it using Stuffit. I think it should unstuff automatically by clicking in the zipped file. And there you have it.
I would post the MP3s myself but they are on my home computer and I'm at my office right now.