cost for designing a custom form?

Unfortunately, we are not offering any paid service for designing custom forms at the moment. However, we can help you with any issues that you encounter once you have designed your JotForm. Creating a form using JotForm is easy by using drag and drop of fields to your form in the builder. You may then apply a theme for your JotForm from the theme-store. You may also design your custom theme from the Form Designer.

Please refer to the guide below that can help you understand the basics of the Form Designer.

http://www.jotform.com/help/300-Form-Designer-Tutorial-Let-s-create-fantastic-forms

If you need to design a form from the scratch, you might need to hire a freelancer from Upwork or a similar place.

Hope this information helps!