How to enter a download code

I have a download code that I got with the game but don’t know how to use it

Message it to me and I’ll sort it out for you :P.

redeem it on the official xbox website

You can either redeem the code on the Xbox website, or you can go to the Store section of the Xbox One dashboard and select “Use a code”.

If you redeem it on the website, the item may not automatically download to your Xbox One. You can check (and, if necessary, download it manually) by going to “My games and apps” on your dashboard, highlighting the Halo 5: Guardians icon, pressing the menu button on your controller (the one just to the left of the X button) and selecting “Manage game”.

Where do i get codes?