How to redeem an Origin code.
You will require an Origin account and the game client, the Origin game client can be downloaded here: https://www.origin.com/nld/en-us/store/download. And you can create an account here if you do not already have one by clicking Register in the lower left hand corner here: https://www.origin.com/.
Open the Origin game client and click the Origin menu in the top left.
Select “Redeem Product Code” then enter your serial code.
The game will be added to your “My Games” section of Origin ready to be installed.