Try your hand at making a page that contains a form. Include a text input, two checkboxes, a set of radio buttons, and a submit button.
When you have the form controls and their corresponding labels, wrap the whole thing in a <form> tag that sends the results to this form using method="get". That will let you see what the form results look like. Play with the form and look at the results until you are sure you understand where everything comes from.
When you are done, change the form to try sending the form results to yourself using the Smith Form Remailer. Do they look as you had expected?