How can I control where jotform adds a field?

There are ways on how to control adding form fields in your form.

- You can drag and drop fields to position it in the form.

- You can also use the arrow keys. The right key moves the form field downward, while the left key moves the form field upward.

You can check this guide to learn more on how to position your form fields: http://www.jotform.com/help/328-How-to-Position-Fields-in-JotForm 

Let us know if that helps.