About modifying the manipulator GUI of routine

Hey, guys. This time I have a very difficult problem.
I have a six axis manipulator on the hardware, and then use the routine of Linux CNC: "puma_cube_robot".
Because I don't have the ability to program from zero, I greatly modified the ". Ini" and ". Hal" and ". GUI" files of "puma_cube" to make them suitable for me.
However, I encountered a fatal problem. The shape of the "puma_cube_gui" model manipulator is different from my actual manipulator. I will put the picture below.
The initial state of the manipulator of "puma_cube_gui" is like an excavator, while my physical manipulator is a humanoid arm. Is there any way to modify the J2 axis manipulator of "Gui" to be straight? Because I am unfamiliar with kinematics and Linux CNC. Is there a simple way to solve this problem? What should I do?

Thank you, Andy. I think I have found a solution to modify the home parameters in "ini"