To instantiate an object from a
class, you need only call the class' "new" method
$new_object = new ClassName;
$new_cat = new Cat("Fred", "white");
When you do so, the new()
subroutine in that Cat class will be called. As
you recall, the new() subroutine created a reference
to an anonymous hash, blessed the reference, and
returned it. Thus, $new_cat will store the pointer
to your cat object.
So once you have instantiated an actual
cat object, you will need to know how to do things with it.
How can I make Fred say "meow"?