If you booked through Couples, then you can call the 800 number and add it. If you booked it elsewhere, then you need to call them. Couples can only sell you insurance if you booked directly through them. If you booked your flight and hotel separate, you will need to contact the airline to get flight insurance. There are some companies that are separate from both the hotel and airlines that you can purchase through, I don't have a contact for you, but I bet someone else will. The thing to look for is cancel for any reason up to the day of flying.
Juliann & Jeff
Jamaica Soon Come