Newsletters: Custom Fields« Usage
Custom Fields is a distinctive and very flexible feature of the WordPress Newsletter plugin.
Custom Fields allows you to define different types of additional fields that can capture additional data from your subscribers when they subscribe.
The following field types are supported: Text Input, Text Area, Checkbox list, Dropdown List, Radio Buttons. The checkboxes, dropdown list and radio buttons take multiple options that a user can choose from.
Start by adding a custom field.