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 have checked your form. You are using Stripe as a payment wizard. However, you seem to be using Stripe to collect donations. On donations mode, coupons are not available. Coupons are only available at "Sell Products" and "Sell Subscriptions" mode:
I hope this helps.
Please contact us again if you need any further assistance.