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're referring to the dropdown field, you can set it to allow multiple selections by editing your form and then doing the following steps:
1) Select the dropdown field
2) click Allow Multiple
But if this is not what you mean, it would be great if you can share with us a bit more information of your concern.