How do you execute the code without pressing the button?

Unity Engine
1

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2

I have no idea about that asset, but find the part where the button calls the method , then look at how the function is called.
Then, in the Update() function, use this:

if(Input.GetKeyUp(KeyCode.Enter)) {  // and/or KeyCode.Return  
  MethodThatWasCalledFromTheButton(parameterUsed);
  }