you cant change it sense there is a bid on the auction it is against the rues to change the terms of the auction after you have set the option for free shipping. Im afraid your stuck sending it to anyone who wins it where ever they live. Im sorry but thats how listia is. You live and LEARN we all do. {:O)
Better to list large items like this as local pick ups only i have pretty good luck with local pick ups it may work for you too. But tough luck on this auction best you can do is refund the winner the credits if they win it out of your area. simply agree to leave good feed back for each other. Not only that but you wont get the credits til it is delivered and winner leaves you good feedback.
Shipping may not be so bad. Just find your own box to ship, and USPS will calculate shipping based on weight and if it's far to ship...may be a little extra. Sometimes FEDEX and UPS is cheaper with shipments like this......just a word to the wise.