Ok! Should i modify the original code instead of getting the one test bitcoin?
I am assuming you want to build something on top of that (at least that's the most obvious reason for forking the code and running it yourself).
So you will have to read and understand the code anyway. Finding and changing a variable seems to be a solid first step.
I'd suggest to simply modify the code according to your requirements.
Your assumption is exactly right. Thanks for your sincere and valuable suggestion！
Next I will work hard to read and understand the code.