Enter the item number into the end my listing earlyform. Decide whether you want to cancel any bids you've received or sell your item to the highest bidder. Then enter the reason you're ending your listing early. Bidders will receive an email letting them know their bids were cancelled.
Click My eBay at the top of any eBay page. In the left column, below Sell, click Active. Find the listing you want to change, and from the menu on the right, select Revise.
You can block the buyer's user ID. Go to the Blocking a bidder/buyer page. Then enter the user ID of the eBay member you want to block in the text box. Click the Submit button.
You can relist the item. Click My eBay at the top of any eBay page. In the left-hand column under Sell, click Unsold. Select Relist from the menu to the right of the item.