I would like to add a "Add button" for phone number/email field

2) I would like to add a "Add button" for phone number/email field.

Please try the Infinite List widget. Here's the demo form: http://form.jotformpro.com/form/51302775889971

Here's what it looks like:

You can also try using the Configurable List widget. Please check the guide: https://www.jotform.com/help/282-How-to-Set-Up-the-Configurable-List-Widget

I hope this helps. If you have questions, please let us know.