I think as a new member you don't have that option yet. I think once you earn your trusted seller badge, you will be able to set a GIN price on an auction.
Wow! I can't believe that went unnoticed for so long. This was a 21 day auction lol. Usually there are some Listians flagging and correcting me soon after listing the auction. Thanks for the help with that. I'm going to update the description now.