Hi olm475,
I'm not sure you're going to get step-by-step instructions 😉 but remember that a flash form (movie) doesn't interact with a PHP file on the server in the same way as a HTML form.
The HTML form sends a request to the server and the server runs the PHP page and returns HTML in response.
But what you want with a Flash form, is that the PHP page only returns the equivalent of a text file containing a string of name/value pairs which are 'requested' and 'imported' into the movie using actionscript.
I'm sure there are pretty good articles about this on Macromedia's website, so have a good look there.
Paul.