First Black jack coupon

Can someone tell me about member rewards coupon for the Golden Gate Pay 2-1 for your first natural black. Do you put the coupon up with a bet and do they take it if your first two cards are not black jack? Does it stay until I get a natural Black jack?
I do not usually play black jack but thought it would be fun to use while downtown.
MO

It stays up until you get your first natural blackjack.

1. Buy in.
2. Tear the coupon out of the MRB so that they see you do it.
3. Lay it on the table near your reserve chips.
4. The dealer will likely call over a pit critter who'll inspect it, then hand it back to you, where you'll keep it face up near your reserve chips.
5. When you finally get a blackjack, push the coupon towards the dealer, who will pay you 2-1 on your bet, and put the coupon in the drop box.

It's a good coupon, good luck.