Php registration form help

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PHP

WAMP

I am trying to make my registration form to be able to put the users information into the databases table but i dont know how i tried different wa but i cant get it to work. If someone would provide code for me that would help a lot :). This is my code:

<?php
include("db.php");
?>
<?php
$username = $_REQUEST['username'];
$password = $_REQUEST['password'];
$password2 = $_REQUEST['password2'];
$email = $_REQUEST['email'];
$submit = $_REQUEST['submit'];

$sql = "SELECT * FROM `users`";

if($submit == true) {
	echo" Thanks for signing up";
} else {
	echo"Something went wrong";
}

?>