You most definitely can update the existing listing without having to re-enter it
To do so, just go to Listings, Maintain Listings and select your listing out of the Add New Listing drop down menu
You can update it's status to Active, change the listing # field, price field, and any other ares that need editing and save
Your listing will then refresh and syndicate out in our feed within 24 hours. You should begin to see it appear back on the various sites in about 2 to 3 days.
Did you delete a listing and need to get it back? Most the time we can restore a deleted listing's data for you. You'll just have to re-upload photos. If you deleted a listing and need us to restore it's data for you, just give us a ring at 888-882-1259 or click your Live Help button located at the top left of your screen.