Go to: Edit Promo> Promo Instructions> Promo Rules> Winner eligibility> Contact Form
Contact forms increase barrier of promotion entry
Keep in mind that by requiring participants to fill out contact info, you might be increasing user's barrier to enter. For less "demanding" connection with your participants, You can turn on the Fan Gate options so all participants need to join your fan page in order to participate. We also have a separate contact form for all the prize winners (except e-coupon winners) to fill out for the purpose of mailing out the prizes.
Be sure to explain how you will be using their info as this relates to consumer data privacy.