Need Help W/ Tutorial For Get Function

[Unholy Prayer]

Ok, I want to use this tutorial so I can make my file name be admin/news.php?act=add.  This tutorial is too confusing for me to even try, but there's never anyone online to explain it to me, so I thought I would ask here.  This is the link to the tutorial:

http://www.allsyntax.com/tutorials/PHP/22/One-File-Website/1.php

Thanks in advance.

[spfoonnewb]

[code]<?php

if ($_GET["act"] == "add") {

echo "Do whatever";
}
else {

echo "Act != Add.";
}
?>[/code]

If you have lots of HTML, or something you can split it up.

[code]<?php

if ($_GET["act"] == "add") {

?>

Any codes can go here, and will only show up if act == add.

<?php
}
else {

echo "Act != Add.";
}
?>
[/code]