Where can I change my form question property width and height?

Add links to your images here and separate them with a new line. Make sure that your image width and height must be the same with the form question property width and height."

Where can I change my "form question property width and height"?

You can change your form question property width and height through either CSS or iFrame when you embed your code.

Here is a reference.

http://www.jotform.com/answers/290351-How-can-I-change-the-width-and-height-size-of-my-form