How can I add a field - like website

You can add fields in your form by clicking on 'Form Elements' and to how to do it then click on 'Basic'.

Here's a demo of how to do it :

After adding fields you can also use Widgets for extra functionality in your form:

Please follow the below link to do so:

https://www.jotform.com/help/252-How-to-Add-a-Widget-to-Your-Form

Hope this helps!

Thank you!