The Add a Constituent Field palette in the Form Console is only available for Create Contact Profile and Update Contact Profile forms. Unlike the fields in the Add a Form Field palette, constituent fields are mapped to Constituent360 which enables constituents to create and update their profile.
Note: The fields available in the Add Constituent Fields palette vary depending on how your site is configured. Although the fields that can be added are those found in the GetUser API and the CreateUser API, your site may not be configured for all of them. If you add a field to a form that is not configured for your site, the information gathered in that field will not be added to the Constituent360 profile.
These fields are added through the Constituent Field Palette. For information on the fields that can be added with the Form Field Palette, see Adding Form Fields.