Thank you bluemarble for your help. Strangely, my booking confirmation looks nothing like yours. After much time on the phone with Cunard I learned that I cannot make a transfer booking online, must do it by phone.
My next problem is that my plane arrives at 7:10 AM and I would have to wait in arrivals until about 10:30 for a Cunard representative and a little later for the coach. A three hour wait doesn't sound very pleasant so I will look for other possibilities.
Point of information for other readers: My booking summary on mycunard shows "invalid date" for all the dates. That and possibly other pieces of misinformation are because I use Safari as my browser. So, other Safari users beware. Life is so complicated!