If you don't know Mambo all that well, I think adding the code to footer.php using any text editor would be the easiest way to go... I was trying to advise you without having used mambo :-p
The module that is on mamboforge is outdated. To use it you have install it then publish it in the administrator area for modules....but like I said its oudated and wont work. The easiest thing to do is insert the code in your footer.php file which you can find the includes directory in public_html. This file is different than footer position that is listed in the module administrator area. You cannot easily impliment this code from within the mambo cms. You have to edit files directly.