The initials of the characters' names in Atlanta Nights spelled out "PublishAmerica is a vanity press."
You can add text to the back cover as an option when you're doing the covers.
Log in to your account. Go to "My Recent Projects." Click on the title. Near the bottom of the next screen (on the right, in blue) is a Create New Revision button. Click it. You're back in the same sequence that you saw when you were creating the book to start with. Hit the "Save and Continue" button until you reach "Cover art." There you'll see the prompt "Click on a cover section to modify it." Click on "Back." You'll get a picture of your back cover, with a text box labeled "Description." That's where you can enter the text to appear on your back cover.
From there, "Save and Continue" to the end, and finish with "Complete Project."