To froth milk with the Bialetti Tuttocrema Aluminium Milk Frother, first heat the desired amount of milk in a pot or microwave until it's warm but not boiling. Fill the Bialetti Milk Frother with the heated milk up to the recommended fill line. Attach the lid securely and pump the handle up and down vigorously for about 30 seconds or until the milk reaches your desired frothiness. Finally, pour the frothed milk into your coffee or espresso for a delicious and flavourful addition to your drink.