To create a custom field, go to Subscribers and click Fields. Here you can see all of the available default fields.
To create your own, click Add new field. Give your field a name and choose the type of field.
Then click Create to save your new custom field. You can use these field in autoresponders and when collecting new subscribers.
Quick note: There is a difference between default fields and the ones you create yourself. You can rename or delete the fields you create. However, you can’t delete the default fields.
For more information, check out our Help article on how to create and use custom fields.