When I signed up I got a confirmation email saying that I was signed up for the promotion:
Dear Ayman,
Thank you for registering for the H3TLI promotion on AA.com.
For your reference, details of this offer can be found on AA.com under view all offers, or in the communication where you learned of this promotion.
To earn the bonus miles or other incentives offered, be sure to meet all of the promotional requirements. For most promotions, activity that occurred prior to registration will not count toward qualification. In addition, please note the timeframe in which bonus miles or incentives will be awarded. These and other specific requirements are always included in the Terms and Conditions listed with the offer. Thank you for your participation.
AA.com
American Airlines