Is that bonus night is redeemable or not? If yes then how do i procees to book?
Best would be to call marriott rewards and book. If you tell us how you got the bonus night we will be able to help you as it might be restricted to certain categories / tiers.
To makes things clear, there are two different things you may mean by "bonus night."
I'm assuming that you got a free night certificate, so here is how to redeem it:
Retrieving data ...