Hi,
At present you cannot edit the text of the listing if you have made a mistake after you have sold an Item.
Why is this it seems like a stupid idea to me as this feature is allowed on ebay.
The only thing that you can do is cancel the listing and relist it this seems a long winded way to do it but I see no other way.
Also when the first purchase has been made you cannot add other features or change best offer or anything else.
Many Thanks
ElectroTech