In resonable plain english what you need to do is:
As one of the previous reply's mentioned you need to make the action in your form = to a php page...
i.e. <form method="get" action="process_form.php">
Then when the form is submitted the info is sent to the page 'form_process.php". Once on this page all the info you entered into the form (i.e. all the input tags you used) is handed over to this page.
(for further info if your not sure of the variable names they are what ever you called them in you <input> tags ... i.e. <input type="text name="somthing_text"> somthing_text would be the variable)
In your PHP for the fictional process_form.php page you then need to open a connection to the database.... then choose the databes you want to use, then choose what table in that database this info has to inserted too.
Once you've connected to the correct place inside the DB you use a statement as the individual above my reply mentioned
insert into table_1 (field1, field2, field 3) (variable1, variable2, variable3)
this tells PHP to insert variable 1 thru 3 into fields 1 thru 3 in the table....
This may or may not shed some light on it... It's hard starting offand understandig how the query's work to connect to MySQL... If you need more help send me an email I may be able to shed a little more light on this for you with a sample file or something with the proper code in it.
ihenman@izome-international.com
Good Luck!