Give a name to your custom field. Unless this custom field is shown in the subscriber area, the name will not be visible by the subscriber.
Choose the custom field type. Depending on the chosen custom field type, additional information can be requested from you.
Enter a default value if there’s any.
You can apply a form validation to the new custom field. New subscribers will need to follow the chosen validation rule when subscribing.
If you make this custom field visible in the subscriber area, subscribers can update the value in their subscriber area.
Make this field mandatory
If you check this checkbox, subscribers will be forced to set a value for this custom field when subscribing to the list.
Force unique value entry
If you check this checkbox, subscribers will be forced to enter a unique value for custom field when subscribing to the list.
Make available across all your lists
Once this checkbox is checked, the custom field will be available in all your lists.