From the COMMENTS I bumped:
kellyb808 posted HOW TO: Posted: Wed Mar 28, 2012 9:14 AM
amyshulk
After logging in, all you need to do is to Bust the Pinata, Riddle 1. Then click continue the ride, not TRY AGAIN. If you are an instant winner, that's when you will be notified. If all you get is the 5 sweep entries, you are not an instant winner. From the rules.... Instant Win Game: The Instant Win Game is only available during the first eight (8) days of the Promotion (beginning noon 3/15/12 and ending 11:59:59 p.m. ET on 3/22/12). When you begin to Ride the Rainbow and complete the first Riddle you will be notified whether or not you are a potential winner of an Instant Win Game Prize. good luck to all
