There are no instructions with it so if you don't have the knowledge on how to fit them, we strongly suggest that you seek for professional help.
Iscooter E9D/ E9T/ E9 Pro Controller Motherboard Electric Scooter - Version 2
Controller Motherboard Iscooter E9D/ E9T/ E9 Pro Electric Scooter - Version 1
Iscooter E9D/ E9T/ E9 Pro Controller Motherboard Electric Scooter - Version 1
Controller motherboard for iScooter E9D/ E9T/ E9 Pro - Version 2
iScooter E9D/ E9T/ E9 Pro Controller motherboard - Version 2