1. declare a variable
2. create validation for it
and test
then create another
and test
$firstname = $_POST['first_name'];
if empty($firstname) {
echo "please include your first name";
}
then add the next variables...
create variable, create validation, test..
if ((!empty($_POST['username'])) && (!empty ($_POST['password']))) {
if (($_POST['username'] == 'testing') && ($_POST['password'] == 'testpass')) {// username and password match