Inserting data into mysql from a form(What everybody assumes every newbie ought to figureout for himself/herself).Help i

[eluser]phpserver[/eluser]
View:::

myform.php

Controller

<?

class Arc extends Controller {
//Validation function included
function insert_into_mysql()
{

//Help

}

}
?>

Model

<?

class Model extends Controller{

function insert()
{
//help
}

}

?>

I have spent a whole week trying to insert data from a form into mysql,i have failed terribly.
I am used to using '$_POST[email]' format when posting data and nothing so far works.
I want to insert email and username into a database from a form as you can gather from above.
Will somebody come to my resque,its friday goddamn it,it has been a long five days.