We've included a sample form to get you started..
If you copy and paste fields, please remember that each field needs it's own unique field name, not just a different prompt.
Drag and drop new field snippets from the drag and drop editor on the right, or use the CK Editor or HTML mode to hack a form.
There is a tab at the top called validation, and that is where you can add data validation. You need to take special note of your form field names. You might find it easier to test your form one time and answer all questions on the page, then you will see the field names in the validation page.