Help with installation 5v wire problem

Hello, so im new to this and i dont have any experience with wires. Just few days ago i got my MG3 and im having trubble installing it. And would be great for someone who has some knowledge to help me out or im stuck with nano board and scrap MG3.
as shown in pictures i followed instructions from Awesome Tech but im missing 5v wire. Question is where do i get the wire from? I did few photos so someone who decide to help me have better understanding of my laser housing and power. Let me say that this is 50w laser 40cm x 40cm. please if we can chat on FB or Whatsapp or any other platform please lets do that because i can follow instructions way better than just typing. on FB you can text me: Facebook
on whatsapp: +38269222528 or Viber. Thanks alot for your time and help





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I am sorry about this. Didnt mean no harm just had this mg3 for 10 days now and cant find no one to help me instal it because i need 5v and im not good with wires and dont have no one to make this happen