friendly urls? how to

[eluser]metaprinter[/eluser]
i'm not understanding where the url is being generated from i think is what my major problem is. Do i need to change something in the database or some php code? if the code, then where? in the product.php controller?

in products.php i have this to start

class Products extends Controller{

//constructor
function Products(){
parent::Controller();
blah blah blah

do i need another function like
function boxes()
{
all my boxes stuff;
}

am i headed in the right direction?