So this is what I did.
I called the toll free number that is on the AAA site (member discount section) and the rep I got was very pleasant and informative.
I explained that I had ordered DirecTV earlier this week and that I did not realize there was additional discounts for AAA members. She was glad to give me the additional discount but had to cancel my original order and create a new one.
At the end of the conversation, I asked her about the coupon book and she asked if I wanted that too and I said "sure"(she did not offer it up, I had to ask). The thing with that was that she had to place it in the original order, so she had to cancel the account she just created and then create a new one.
I did have to pay the $19.99 + tax for the year free of Showtime but to me i think that is worth it.
So when you are placing your order ask about the book and any other discounts you may qualify for so that you will not have to go through cancelling an order and re-creating.
With the discounts, I am saving approx $30 month for the first year.
That sounded to me they still do not allow modification of an order.
The $19.99 sounded like the shipping and handling fee, which for most of us it can be waived too, but somehow for some it was not possible.