What must an author do to include custom messages on a form?

To include custom messages on a form, an author must add messages to the script during form creation. This process entails embedding specific instructions or feedback directly within the form's code, enabling the application to display tailored messages to users based on their interactions. By implementing the messages through the script, authors can ensure that the content is relevant and contextually appropriate to the user's actions or inputs.

The ability to customize messages in this manner enhances the user experience, providing guidance, alerts, or information that can lead to better decision-making and smoother navigation through the form. Custom script messages allow for real-time updates and tailored interactions, which are not achievable through other means like external integrations or pre-existing templates. This direct approach gives the author control over the communication conveyed to users, making it a crucial aspect of form design.