You can use its default id (which starts

You can use its default id (which starts with

, etc, or change its ID to a better name by clicking on the the

pencil

pencil

on the left panel (inside

Components

Components

). On a button, you can click on

Create an inline script

Create an inline script

, choose

JavaScript

JavaScript

and you can use the input value using its id dot result, e.g:

txtNumber.result

txtNumber.result