There’s no C code in it, just comma-separated numbers that the main code will stick in an array at compile-time. Beyond that, it is a normal Arduino program and you can do what you like.

The Arduino IDE provides a sample sketch with a simple program outline in a text window when you first open it. There are also a vast array of code samples under the File->Examples submenu item.

That’s where CodeBender.cc comes in. CodeBender is a browser-based IDE that supports uploading to nearly any Arduino board. You can use the program to copy sample code, browse code uploaded by ...