Custom field group: The particular custom field group that is added is to be selected. Before adding the custom field one will have to add the custom field group. There are different fields present that can be added in the form such as the textbox, textarea, password, checkbox, radio button, select box, multiple select boxes.
Text box / Text area / Password: You can add the above custom fields with similar details to be entered for the various parameters.
Checkbox, Radio button, Select box, Multiple select boxes: All parameter related to these custom fields would be same. The value and the details of the different parameter which are available with these selections should be entered like field detail, field title, user editable, etc.
Date time: The custom field for date and time can be added from here which will display the calendar for selection. To add this custom field you are needed to fill up the parameters which appear after selection.