I downloaded and installed this add on for osCommerce 2.3.4.1. First of all, I'm trying to figure out which file to edit and upload. I also need help with the coding. How is the date formatted for the expiration date of the discount code? Is the file catalog/admin/discount_codes, or catalog/includes/languages/english/modules/order_total/ot_discount, or catalog/includes/modules/order_total/ot_discount, or all of them? This type of setup is new to me. Since I just installed and re-did my catalog, I would like to attract customers by adding a introductory discount. Please help me with these codes. I would like to offer a 15% discount but not sure how to configure this one.