Question [Q] How to patch open source code to a kernel?


I have a LG F260s/Optimus F7 and I would like to add fauxsound to the phone which enhances the audio quality, however, this following occurs to me. I know I need to get the kernel file and flash it, however, I do not know how to "add the source code" whatever it is being told in the picture. Thanks for any response.

What tools and procedure I need to enable that? The phone is already root and have busybox installed.
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