JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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 I was able to change the name for one of the products, please see the screenshot:
You are always able to add the products that you want, I would like to share you this guide where you will find more information about setting up your order form: http://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form.
I noticed that you have added options to your products so this guide could help you as a reference: http://www.jotform.com/help/225-How-to-add-options-to-Payment-Forms.
Do let us know if the issue still persists and please, provide us the steps to replicate it so we will make some tests.