I am not sure either, but if you go down to the bottom of this site (on a computer), there is a member support and they usually have the answer. I will look as well.
I am not allowed to take my bid back and their is no way for you to support it. I have wait until someone out bids me. My last bid was 13999, if anyone wants to outbid me please do. I am sorry, I was really wanting to win until I found out I had the ring size wrong. I am sorry to complicate things for you. If you want to edit your auction to say that the highest bidder does not want the item and how much I bid so that someone can outbid me, that would be great.