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.
If you mean change your form URL that's possible. There are actually different ways to achieve this.
1. Embed the form to your website. By embedding the form to your website, you will now have to use the website URL where you have embedded your form when you share it with your users, not the form URL.
2. If you just want to change your form URL with your own domain, follow this guide. http://www.jotform.com/help/144-How-to-use-Custom-Domains-with-Jotform
In addition to this, you can also create a custom URL in your form but this doesn't remove the jotform.com domain in it, just the form ID (long string numbers at the end of your default form URL).