Basic concept

If you add a text input component to the canvas, you will be asked to specify the label, for example First Name. If you do that immediately after adding the component to the canvas, Workflow Designer automatically creates a variable based on your input, for example {{firstName}}. You can also add or change the variable name in the General section in the properties bar.

The text value entered in the text input field is stored under this firstName variable, which you can use in other components to build dependencies between form fields.