Object of classes and attributes

Hey guy I am studying and I am trying to solve this hard exercise.

on the above picture I am trying to implement this into a code: however I find it extremely hard. I have tried the following at the moment, don't know if its correct or not, can someone please help me?

just some info that the assignment says: -The attribute product should be an objekt of the class Product

• Shipping adress and billing address should be an object of the class Adress
• User should also be an object of the class User
• CalculateOrder (should calculate order and sum the price for everything
• Calculate vat should add 25 %
• printAllorders() should print all orders

what is mean by "object of the class"