The Flash SWF files are non-editable, however you can edit your ad copy (the texts you use in your banner) at any moment without having to create / purchase new 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 enter your new ad copy and generate updated banner file. The Instant service users should contact us with the new banner texts and the order number.