Click on your username in top right hand corner and hit my account from there look to left where it shows how many auctions you have open and click on open auctions then click on this item( it will appear in too middle of page) and it should pull up your item up for auction and when that page pulls up you look up to mid-top right and you will see an EDIT tab then click edit and go to ADVANCED OPTIONS tab where you set the amount of days from the beginning and reclick a lower day than what you originally set and then press UPDATE tab on the bottom and it should change the days. If you have trouble just reply back okay?