Have you looked at the links in the documents section of the product page? Then you would have found the hookup guide. Which explains which commands to store in a config file to make operate in a certain way.
Googling I also found this PDF from sparkfun. It looks like the Hookup-guide:
https://www.sparkfun.com/products/12772
If you wish to change the program that it is running then you can write your program in C/C++. But you'll need to find a development environment for that chip, arm-based LPC2148. Here is another Sparkfun tutorial that talks about it.
https://www.sparkfun.com/tutorials/94
I never did this or owned it so I can't help further.