Start be reading the code and working out what it does, and how it does it.
It's fine and dandy to find code on the internet, but if you don't want it to do exactly what it did in that application, you will always need to modify it to suit your needs. And that means understanding how it works, not asking someone else to do your homework for you.
The idea of "development" is as the word suggests: "The systematic use of scientific and technical knowledge to meet specific objectives or requirements."
BusinessDictionary.com[^]
That's not the same thing as "have a quick google and give up if I can't find exactly the right code".
So either pay someone to do it, or learn how to write it yourself.