A seller must have their "Seller's Wings" badge before they can add the GIN option to their auction. To get your "Seller's Wings" badge, you must complete the following requirements....5 positive seller feedback ratings, 5 listings, and a 90% positive seller feedback rating after being a member for 20 days.
I know you have that badge...I looked at your badges first. I was just letting other members know this so they know what to look for! A lot of new members don't know that information. They also don't know that once a bid has been placed, you cannot add that option.