Here's what the relevant lines in this page do:
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<form method="post" action=" http://www.yourwebsite.com/phpscripts/formoutput.php">
When the 
button on the form is clicked, the script formoutput.php will execute.
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<input type="text" name="yourname">
This puts a textbox called yourname on the page.
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sub getFormData {
Defines getFormData as a user function, then starts it.