My <form> in Page can't find it's .php action script

I am new to WP. I love your theme atahualpa.
I would also like to maintain my own tables on the MySQL db, have created them etc.
I have added the exec-php widget to run php on my pages and created a form on a page. I have had no luck with a regular method="post" action="processData.php"
I tried the jquery example from the net-tut tutorial: "Submit a Form without page refresh". Again, the js runs but the "process.php" doesn't. Maybe it's in the wrong place.

Please help!: