1.Download and install Epic games launcher: Here
2.After the Download is complete run it and install it.
3.Once Epic Games is installed, open it and log in with your username / password (create one if needed).
4.Once logged in, click on your Username on the bottom left corner and then click on redeem code.
If you require more specific help, or if you have any questions, don't hesitate to to Contact us by Chat or normal contact form.