Hi Kathy in PA,
In order to post a "Buy it Now" only listings with the "Best Offer" option, you must first select either "fixed price" or "store item" from the sale type area in the upper-right of the Auctiva lister page and choose a category the support the "Best Offer" option. Auction format listings do not support the use of the "Best Offer" feature.
Once you have done so, you can enter your "Buy it Now" price in the "Buy It Now Price" field, and indicate that you are willing to accept offers by checking the box labeled "Accept offers from buyers" below. These fields are located between the "Select an Image" boxes and the "Select Template" button on the Auctiva lister page.
Any additional questions or concerns? Please contact our customer support team using the appropriate link on our help page:
http://www.auctiva.com/free-auction-software-help/help.aspx-Mike