you can't change anything in the auction once you have bids...all you can do is add a comment but the days, etc., have to stay the same. You need to get verified so you will get higher bids, but it's almost over so .... Just be sure to package the ring carefully, preferrably in a ring box or another box, and not just in a white envelope with first class stamp.
In order to get better results from your listing, please add a clear, close-up picture of the item in your possession instead of using a commercial photo taken by the manufacturer. We also highly recommended writing your Listia username on a piece of paper and showing it next to your item in one of the pictures. This really helps people to bid with confidence because it proves the item is in your possession.
This isn’t a requirement, but it’s strongly encouraged, so you’ll get more bids and more credits for your item. It'll also prevent your listing from getting flagged and potentially deleted.