Get it now. So basically instead of waiting the full 8 days, and having people bid on it, hoping people bid close to the number of credits you were hoping for. you just set a credit number you would be happy with selling your item at.
So since you already have the auction going, go to "my listia" then "giving away". Then you can click on a auction you already have going, and edit it. It should said edit, or if your using an app. It looks like a little pencil at the top. Click on that. And before when you were able to choose what you wanted your starting bid to be, there should also be an option to do a GIN. You should be able to have GIN and a starting bid number.
Oh dang okay. Looks like I'll have to wait. Or if one of your other items sell before this one. You will get the wings and be able to do a GIN on this auction