The first place I would look for contact information related to the contest you may have won is in the so-called "small print" on the face of whatever game piece or form you used to participate in the contest or game. There is likely contact information, a web address, or a toll-free telephone number related specifically to the contest. If not, you could call 1-800-TacoBell and ask them for contact information for their marketing department or legal office, both of which were probably very involved in creating the specific game you played.