Applescript novice needs help with downloaded script

Hello
I have downloaded a pre written applescript to help me format an SD card to FAT16 and then load it with some software to put in my camera. I have to be honest this is mostly all over my head.

Please see link below and if anybody has an idea how to do this in simple layman's terms I will be most grateful!

http://chdk.wikia.com/wiki/FAQ/Mac

Many thanks!!

Rob