Using Ad-Hoc fields

Ad-hoc fields are mostly empty common fields that you can customize for usage - Text Boxes, List boxes, Drop downs, Radio Buttons etc.

STEP-BY-STEP

1

Go to Form Elements Tab
2

Drag/Get the TextBox field - or any other preferred fields that are present and useful on the Form Elements tab
3

Update the ID/Name to the preferred ID/Name (ie. DietaryRequirements, CarModel)
4

Then click Save to apply the changes made
5

Please also note that most ID/Name of the fields in the Form Elements tab can be edited, so these will most likely be the go-to fields if you needed a customised ID/Name.