You can't -- and probably don't need to -- add data fields to a form. Each form is supplied with an extensive array of data fields that apply to the form's purposes. However, you might be able to serve your needs by activating or pasting a copy of a data field on a form. To do this, use To activate a data field and To copy and paste a data field. To view all of the fields -- both active and inactive -- that are available on a form display the Customize window for that form. If you need help doing this, see Open the form in the Customize window.