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'm not sure if I understood your concern correctly. Upon checking your account and the form, I see that you have a tour reservation form. I've cloned that form and edited the field that has the number of people in a group on it.
Here's a guide on how I edited that field and set a min and max value on it.
I hope this helps. Let us know if you need more information on this.