Search is your friend!!!! very simple search found this using the term "Lincoln" and searching the american airlines forum.

to get the 500 miles use this one
https://secure.lincoln.com/aa/register.asp

to download the form to get 5000 miles for test driving use this one
http://www.aa.com/content/images/eSu...ashMarch06.htm

NOTE - you can go into a lincoln dealer and tell them you have this deal and to save your time and theirs could they please fill it in. May or may not work, depends, also you may want to take the test drive.