Can't get PHP to process form data into MySQL database

I'm trying to process some HTML form data into a MySQL database using some PHP, but this is my first foray into webdev and I think I'm in over my head. The form is POSTed to the formSubmit.php file, which turns them into the variables that the sql command then queries. I've tried changing round the variable layout, but it still won't send for some reason.

The HTML form:

formSubmit.php:

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