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You can Show/Hide field with using of conditional logic. Inside of this article you can find out how to do it:
Here is a demo form: http://form.jotformpro.com/form/51455745146963?. Inside of this form we have used conditional logic to hide and show fields.
You can clone form for closer look.
Hope this will help.
Great! I was choosing the wrong field, no wonder it didn't work. Thank you very, very much.
We're glad to know that you've already figured it out. Should you have any questions in the future, please feel free to let us know and we will be glad to help you anytime. Thank you.