I have no clue. Sorry. I'm trying to figure out how to link this to my twitter and how to verify my address (because some ppl on here require it for you to bid)
Once someone has placed a bid you can't alter the auction in any way!
But if there was no bids click on your auction and in the right top corner there is an update button click on that and you can set up a GIN and other settings to your auction!