How to power 12v Electromagnet from cnc shield v3 for arduino uno?

I connected 12v 5a power supply to cnc shield v3 for arduino uno and two nema 17 stepper motors are connected with two DRV8825 motor drivers to the cnc shield v3. I want to supply power to 12v electromagnet from cnc shield v3 and also I want to supply power to arduino uno board itself from cnc shield v3. How can I supply power to both 12v electromagnet and arduino uno from cnc shield v3 ? I am a beginner.
I want to know which pin of cnc shield is to be connected with 12v electromagnet and which pin of cnc shield is to be connected to arduino for power supply to arduino?

That is okey. What stops You?

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I want to know which pin of cnc shield is to be connected with 12v electromagnet and which pin of cnc shield is to be connected to arduino for power supply to arduino?

Which driver board? Post a link to the data sheet.
It is possible to connect a 12 volt supply to the Vin pin of the UNO.

Seems you need TWO electromagnets. Each one will be connected as if you had the two coils of a stepper motor. Do you have two? Otherwise you will likely destroy the controller board.
As for the control pins of the DRV8825, use whatever pins your software requires.
Paul