How can I have a search function on my form?

Hi Support, what form element includes the search. I can seem to find it

Where or what would you want to search? 

I would suggest you to check the following elements: 

https://widgets.jotform.com/widget/spreadsheet_to_form

https://widgets.jotform.com/widget/dynamic_dropdowns

https://widgets.jotform.com/widget/autocomp

This guide will help you adding the elements to your form: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-Your-Form