Insertar codigo en formulario - How to insert javascript code

Hola, como puedo insertar codigo javascript en un formulario jotform ?

!! Gracias

To be able to add/insert your own functions using javascript code, you will need to use the full source code of the form. You will have to host the form on your own website.

User guide: How to get the Full Source Code of your Form

Let us know if you need further assistance.