A basic setup with no styling to customize it as you need.
1) Copy the elements inside the div block called "COPY ELEMENTS INSIDE".
If you are not using the hidden form functionality, don't copy the hidden form element.
2) Style the warning class for the inputs, you can do it by using custom CSS or by creating an element like this in the stylesheet of your project:
3) Copy the custom code from the before < /body> tag section of this page settings.
If you are not using the hidden form functionality, delete the hiddenFormID property from the code.