The Flash SWF files are non-editable, however you can make up to five minor changes to your ad copy (the texts you use in your banner), such as fixing typos or slightly re-wording your ad, without having to create / purchase another banner. Banners created with the Pro service can be updated through your Pro account - just login and select a banner in the "Your past orders" section. It will allow you to update the ad copy and your banner SWF file. The Instant service users please contact us with the updated copy, line by line, and the order number.