To use textbox field you get into edit mode. Then, drag and drop the form widget onto the page. Hover over the form widget and click on the pencil icon. Next, drag and drop a basic textbox field. Double click on the field and click the pencil icon to edit it. The textbox field allows you to enter a single line of text.
Text box field is used in conjunction with any FORM ITEM WIDGET. You can place a single line of text into the form making it highly customizable. Drag the widget into any form and edit it.