How do I implement edited boiler algorithm source code for modeling?

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Hello everyone! Student here,

I plan to change the source code for the boiler calculations and use it to do modeling. How can I use that new source code for modeling? I see the source code on Github, but I am having trouble on how to implement the changed code. I only see the source code on Github but not in my EnergyPlus folder that lives on my C drive. Where do I put this new changed code within my EnergyPlus folder, that lives on my C drive, to do modeling with the new code?

I found the specific source code on the Github, and it is written in C++ and is available at:

https://github.com/NREL/EnergyPlus

For example for the boilers, I found the source code here:

https://github.com/NREL/EnergyPlus/bl...