Open your Samsung member from your phone you will find a button "benefit" click on it then there will be an option redeem voucher open it and click redeem a code will be redeemed then follow instruction put your address phone number etc ...
You need to download Samsung Memebers App then you ll go to benefits tab and then coupons sention there u can redeem it. But Samsung haven't given anyone that coupon so far. So go to Samsung website. Open chat and talk to them stricktly.
It does not come along with, it's after when you have received your phone - apply to redeem your gift by uploading your receipt with (Samsung logo) on it, once approved they will dispatch it to you. Might take 2 months after confirming.