Problem dealing with .h files / Solar tracker

Hello !! NEWBIE here

I found a program online : https://eeenthusiast.com/arduino-solar-tracker-stepper-motor-light-resistor-tutorial/

And the header file is there : Citi7-21/CustomStepper.h at master · jogaye/Citi7-21 · GitHub

I try to create the file directly in the IDE but I still get those messages

‘’ SOLAR_TRACKER:12:10: fatal error: CustomStepper.h: No such file or directory

#include <CustomStepper.h>

^~~~~~~~~~~~~~~~~

compilation terminated.

exit status 1
CustomStepper.h: No such file or directory ‘’

I hope someone can help me !!!

Thanks in advance

Keep in mind I’m an absolute newbee but very entusiasth !!

Annotation 2020-03-29 170433.png

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