there is not a simple way to add a discount manually, there are couple places where the code would need to be edited.
forward your FTP information and I can edit the eCart object file for you to add the discount in.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.