In Aug. I'm staying long-term at a residence inn in AZ. I had to personally talk to someone to acquire a lower rate for the long term stay. I enrolled into
Marriot Rewards.

When I check in, I plan to give the front desk my marriot rewards number.
During my stay, where is the site that allows you to enter the codes to help boost my points or give free nights,etc..?

Any advice / strategy on making the most of my points during my long term stay?

Thank you