Go to the HAL website and click on Cruise Deals. Scroll down through the offerings and you will see the AARP OBC offer. Click on that ace follow the instructions. They ask for your mariner number and your AARP member number. It takes 5 minutes to fill out. Once you do that, it automatically applies to certain newly booked cruises. If you have already put the deposit down on one, you will not get the AARP deal. It must be a new booking.