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.
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.