The form then requests that they return to the form and correct the problem. Customizing the error page involves two steps. First you must declare which fields are required, otherwise when your visitor submits an empty form no error has occurred so they will not see the error page. You can require as many of your form fields as you want. You then put a colon after the NAME and enter your error message.
Additional examples follow with different names and locations.
This line should appear only once in each form that uses the Form E-mailer utility. The name of the page is unimportant except in making sense to you as the web site developer. The location of the page, however, is important. The page must be in the same web site as the form that uses it, and the name and location must be relative rather than absolute . This is important since you want to share the data from the form with the error page, which cannot be done if the form and the error page are not in the same web site.