What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I checked your form and it seems like you have already setup coupon codes on your payment integration.
You can follow the quick step-by-step guide below to add a coupon code:
1. First, open the payment wizard.
2. Click the "COUPONS" tab. Here you can add and manage your coupon codes. Click the "Create Coupon" button.
3. You can then setup the coupon code here. You can set the code itself, limits, discount percentage, etc...
I hope that helps.