The Opt-in Field is a specialized checkbox field that presents the user a single checkbox and supporting message. Unlike most other fields, the Opt-in Field does not display its field label by default.
A short message to indicate what a user is opting-in to.
The Opt-in Message setting supports Markdown so you can emphasize text, link to a supporting page, or even use HTML. Example message with a link using Markdown:
Selected by default
Enabling this setting effectively makes the opt-in field an 'opt-out' field. Be respectful to your users.
This setting will display the Opt-in field as checked by default.
Value When Selected / Value When Not Selected
By default, when the Opt-in Field is displayed in Notification Emails, the value of the field will be displayed as "Yes" for someone who has opted-in and "No" for someone who has not. Update these values using these settings.
Make it Required
As all Form Fields, you can mark the Opt-in Field as required. Marking the Opt-in Field as required will ensure that the user checks the field before they can successfully submit a form.