PWM pin identification

Dear friends,
I’m working on a marlin version to control my 24V laser module that I’m attaching to my 3D printer (Kingroon KP3s)
I’m trying to configure these pins in marlin. I’m using Marlin 2.1.x bugfix
#define SPINDLE_LASER_PWM_PIN
#define SPINDLE_LASER_ENA_PIN
My laser module attaches to MKS robin nano motherboard through an inline driver that is placed in E1 motor driver

attached are pictures of the module and inline driver

Please help! I’m desperate here