Go to the listing.
Top left corner. REVISE.
Click and it will take you to the listing where you can correct it.
Adding a Reserve will cost you money even if the item does not sell. I would suggest instead changing your asking price to the minimum amount you would like to get. Also a lot of bidders will pass over listings with Reserves rather than waste time bidding without any chance of actually winning.
If you have bids, you will not be able to Revise.
You must first end all the bids and then end the auction. You can then relist the item with corrections. The original bidders will probably not bid again.
You do not see the maximum bids of your bidders, only the high bids. You do not see snipe bids that watchers plan to place. You do not see electronic snipes that will be automatically placed in the last few seconds of the auction.
